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Gepubliceerd in: Mindfulness 7/2020

Open Access 02-03-2020 | REVIEW

Mindfulness-Based Programs in the Workplace: a Meta-Analysis of Randomized Controlled Trials

Auteurs: Ruben Vonderlin, Miriam Biermann, Martin Bohus, Lisa Lyssenko

Gepubliceerd in: Mindfulness | Uitgave 7/2020

Abstract

Objectives

Given the complex demands of many workplaces, there is growing interest in the potential beneficial effects of mindfulness-based programs (MBPs) for employees. This meta-analysis systematically synthesizes the results of randomized controlled studies conducted in various workplace settings.

Methods

Eligible studies were identified by a systematic literature search in four electronic databases and complementary manual search strategies through 11/2018. Random-effects models were used to synthesize data across 56 studies including n = 2689 participants and n = 2472 controls. The validity of synthesized effect size estimates was analyzed for heterogeneity and influential cases (outliers). Risk of bias was assessed following Cochrane recommendations.

Results

Analyses of between-group effects indicated that MBPs effectively reduce stress, burnout, mental distress, and somatic complaints, while improving mindfulness, well-being, compassion, and job satisfaction—all with small to large effect sizes ranging from Hedge’s g = 0.32 to 0.77. Results were maintained in follow-up assessments ≤ 12 weeks. Heterogeneity among primary studies was not explained consistently by program or participant characteristics in the exploratory moderator analyses. Results on work engagement and productivity were limited by low numbers of primary studies with outliers among their effect sizes.

Conclusions

Our meta-analysis provides evidence that MBPs effectively promote the health and well-being of employees in various occupational settings. Further research is needed to investigate potential benefits on work-related outcomes and effects for longer-term follow-ups.
Opmerkingen

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s12671-020-01328-3) contains supplementary material, which is available to authorized users.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Globalization, digitization, and societal transformations have changed the world of work dramatically in the last decades: work processes have become more complex, more intense, and require more flexibility and mobility from employees (Mack et al. 2015). Productivity per hour worked has increased by approximately 20% since the year 2000 across OECD countries (OECD 2018). Adverse effects of the increased psychosocial demands include prolonged work-related stress, exhaustion, burnout, and subsequent health impairments (Quick and Henderson 2016). Absenteeism and presenteeism account for major productivity losses and high societal costs in industrialized countries (Schmidt et al. 2019; Strömberg et al. 2017). Consequently, health promotion has become an important objective in occupational settings.
Mindfulness-based programs (MBPs) have attained an outstanding position among occupational health promotion programs. The proposed benefits go beyond personal well-being to cover key aspects of workplace functioning (e.g., Hülsheger et al. 2013). Both components of mindfulness, as defined by Bishop et al. (2004), have been discussed with regard to their potential for work performance (Good et al. 2016; Hyland et al. 2015). The self-regulation of attention to the present moment is thought to enable individuals to better focus on the tasks at hand, be less distractible to extraneous stimuli and avoid mistakes (e.g., Glomb et al. 2011; Good et al. 2016). Relating to one’s experiences with curiosity, openness and acceptance has been proposed to spark creativity, open new perspectives, enhance problem-solving, and facilitate coping with uncertainty (Baas et al. 2014; Jacobs and Blustein 2008; Lebuda et al. 2016; Ostafin and Kassman 2012). These intrapersonal qualities might positively affect interpersonal functioning (Moll et al. 2015) and leadership behavior (Nübold et al. 2019; Reb et al. 2019; Schuh et al. 2019). Thus, workplace mindfulness is expected to improve not only individual well-being and performance but also the productivity, agility, and innovative strength of organizations on the whole (Greiser and Martini 2018).
Building on enthusiastic reports from pioneering companies since the late 1980s, an exponential growth in popularity sparked in the 2000s, when a number of large companies launched mindfulness programs for their workforces—the most influential Google, General Mills, Intel, and Target (Gelles 2015; Schaufenbuel 2015). Meanwhile, the provision of services related to mindfulness and/or meditation has become a billion-dollar industry (Wolever et al. 2018). In a survey conducted by the National Business Group on Health (USA) in 2018, about 60% mid- to large-sized US companies reported offering mindfulness, yoga, or meditation courses to their employees (NBGH 2019). Prominent examples cover a wide range of industries, such as hard- and software development (e.g., Microsoft, Apple, Cisco, SAP), social media (e.g., Facebook, LinkedIn, Twitter), long-established industrial companies (e.g., Beiersdorf, Bosch), clothing and furniture (e.g., Nike, IKEA), global service providers in finance/insurance (e.g., Aetna, Goldman Sachs), and political institutions (e.g., UK Parliament, US House of Representatives) and numerous programs in health care and educational settings (Burton et al. 2017; Klingbeil and Renshaw 2018).
Interestingly, this large-scale implementation has progressed without sound empirical evidence for the anticipated effects on work-related outcomes (Jamieson and Tuckey 2017). Several scientists have provided a logically stringent theoretical rationale on how empirical findings from other contexts might apply to work performance and productivity (e.g., Good et al. 2016; Hyland et al. 2015). However, the proposed correlates of mindfulness were predominantly investigated in cross-sectional studies (Mesmer-Magnus et al. 2017), thus not allowing inferences, whether similar effects can be achieved through training.
Intervention studies in other settings have shown that mindfulness training provides a variety of benefits by inducing positive changes in attention, cognition, emotions, behavior, and physiology (Hendriks et al. 2017; Jayawardene et al. 2017; Khoury et al. 2015; Spijkerman et al. 2016). However, it has been questioned whether these results can be transferred to occupational settings (Jamieson and Tuckey 2017). Several contextual characteristics may influence the acceptability and potential benefits of MBPs, including working conditions, organizational culture, social norms, and work patterns in specific industries or professions (Glomb et al. 2011; Sutcliffe et al. 2016).
The strong interest in MBPs in workplace settings is reflected by a growing number of systematic reviews. Qualitative reviews have provided an overview of empirical studies across occupational groups (Eby et al. 2019; Jamieson and Tuckey 2017; Janssen et al. 2018; Lomas et al. 2017a) and in specific settings, such as teaching/education (Hwang et al. 2017; Lomas et al. 2017b), health care (Boellinghaus et al. 2014; Escuriex and Labbé 2011; Irving et al. 2009; Lomas et al. 2018; Luken and Sammons 2016; Morgan et al. 2015; Rudaz et al. 2017; Smith 2014), social workers (Trowbridge and Mische Lawson 2016), and managers (Donaldson-Feilder et al. 2019). Although most authors draw encouraging conclusion, the inclusion of uncontrolled studies with a varying methodological quality impede the evaluation to which extent effects can be achieved.
Most previous meta-analyses either refer to a specific occupational group, such as teachers (Iancu et al. 2017; Klingbeil and Renshaw 2018) and mental health professionals (Barns 2017; Burton et al. 2017; Lomas et al. 2018), or to specific outcome variables, e.g., psychological distress (Slemp et al. 2019; Virgili 2015) or burnout (Iancu et al. 2017; Slemp et al. 2019). Two recently published meta-analyses allow a more comprehensive assessment of empirical effectiveness by reporting synthesized effect sizes based on randomized controlled trials (RCTs) published before January 2016 (k = 35; Lomas et al. 2019) and May 2016, respectively (k = 23; Bartlett et al. 2019). However, the exponential increase in popularity also seems to apply to intervention research, as the number of published RCTs has almost doubled between 2016 and 2019. The primary objective of this meta-analysis is, therefore, to update the aforementioned meta-analyses and to extend their work by synthesizing effect sizes on work-related outcomes and long-term effects of MBPs in the occupational setting. The secondary objective is to explore characteristics that may influence the magnitude of effects on different outcome domains.
Several authors have emphasized the large variability across MBPs and the associated difficulties to evaluate their efficacy (e.g., Van Dam et al. 2018). Most empirical research in healthy populations has been conducted on the “classical” manualized form of Mindfulness-Based Stress Reduction (MBSR; Kabat-Zinn 1990; Khoury et al. 2015), but a variety of other multicomponent programs have been designed, combining basic meditation practices with yoga exercises, informal mindfulness techniques and elements of compassion. In workplace settings, the variability of MBPs seems to be even larger (Jamieson and Tuckey 2017). To consider the needs of employees and organizations, a variety of modifications have been made to manualized MBPs, such as shortened versions of MBSR (e.g., Huang et al. 2015; Klatt et al. 2009; Manotas et al. 2014) and several idiosyncratic curricula have been developed, which couple mindfulness elements with other training, such as emotion regulation, compassion, or physical exercise to produce beneficial synergistic effects (e.g., Jennings et al. 2013) .
These modified MBPs differ largely in time scope and mode of delivery—all of which might impact their effects on outcomes (Jamieson and Tuckey 2017). Across contexts, brief mindfulness training programs and digital interventions have become increasingly popular due to their advantages in accessibility and availability (Mrazek et al. 2019; Schumer et al. 2018). In the occupational settings, some programs keep to the in-class group format, some use blended curricula combining classroom learning with online practices or e-coaching (Allexandre et al. 2016; van Berkel et al. 2014), while others are delivered exclusively through the internet (Aikens et al. 2014; Wolever et al. 2012). The location of delivery might intensify or diminish contextual influences, e.g., due to implicit associations of office buildings with occupational stress experiences. To account for this variability, we examined possible moderating effects of delivery mode and location, type of program, time scope/duration, and recommended practice at home.
Most empirical studies in occupational settings focus on specific professions, and thus include samples with distributions of participant characteristics different from those in general health promotion. Previous meta-analyses in healthy populations have noted to a preponderance of young female participants in MBP studies (Khoury et al. 2015; Spijkerman et al. 2016), which aligns with general research on the utilization of preventive health care (Dryden et al. 2012; Koopmans et al. 2012). Occupational settings might be an opportunity to reach more diverse populations, possibly including more males and/or older participants (e.g., Martin et al. 2009). Thereby, specific occupational demands and characteristics of professional groups have to be considered (Good et al. 2016). Health care professionals for instance seem to be a logical target group for MBPs due to their exposure to high interpersonal demands and physical stress (Burton et al. 2017). At the same time, this group of professionals might be particularly inclined to cultivating mindfulness skills (Irving et al. 2009). A less favorable climate might prevail in the context of “tough, male”-oriented occupations, such as police officers or firefighters, including social norms, attitudes, and expectations that possibly lower the acceptance and effects of MBPs (see e.g., Krick and Felfe 2019). Other implicit features of samples can include the level of education required to practice a profession or work experience aligned with certain hierarchical positions. To investigate possible influences of these characteristics, we conducted moderator analyses on age, gender, professional group, level of education, and work experience.

Method

This meta-analysis was conducted according to the PRISMA-guidelines (Moher et al. 2009; see PRISMA-checklist in Appendix E in the supplemental materials) and the Cochrane recommendations for the reduction of subjectivity biases and data extraction errors (Higgins et al. 2011). Accordingly, all process steps involving decision-making (e.g., abstract and full-text screening), manual transfer of data (e.g., extraction of data from original studies), or evaluation (e.g., risk-of-bias assessment, clustering primary outcomes to review outcomes) were performed by two reviewers independently, based on standardized coding schemes. Conflicts were discussed and resolved in the reviewer team. A protocol for this meta-analysis was pre-registered and is available in PROSPERO (CRD42015019282).
We conducted a systematic literature search up to November 2018 in the databases PsychInfo, PubMed, Web of Science, and Academic Search Premier based on the following search strategy: (((DE “Intervention”) OR (DE “Prevention”) OR (DE “Clinical Trials” OR DE “Treatment Effectiveness Evaluation”))) AND ((DE “Mindfulness”) OR mindful* OR (DE “Meditation”) OR meditat*) AND (work* OR (DE “Occupational Health”) OR (DE “Occupational Stress”) OR job). Reference lists of the included studies were screened for relevant literature, and authors were contacted for unpublished and/or incomplete data.

Study Selection

First, abstracts of all results were screened for eligibility criteria: (a) the reporting of empirical data, (b) mindfulness-based program, and (c) not explicitly conducted in a setting other than the workplace. Second, full texts of eligible studies were assessed for the inclusion criteria: (1) sample of healthy adults (age 18–65 years) with close to full-time employment (> 30 h/week), (2) any type of mindfulness/meditation-based intervention with at least 2 h of training and with mindfulness elements constituting at least 50% of the program, (3) programs offered at the workplace or initiated by the employer, (4) randomized control trial design, (5) report of mean (M), standard deviation (SD), and sample size (N) for all relevant outcome measures, or (6) sufficient information to calculate those values. Studies were excluded if they could neither be obtained via electronic access, interlibrary loan, or contact with the authors (Fig. 1).

Coding of Study Characteristics

The following characteristics were coded for each included study:

Setting

Country and organization/corporation in which the study was conducted.

Population

Age, gender (% of female participants), education in years, and work experience. The occupational profession was assigned to the categories of health care, public administration, law enforcement, industry, science, teaching, finance, marketing, phone service (call center), or mixed profession.

Program

Hours of attendance, time span in weeks, delivery method (i.e. in class, online, blended, audio), and location of delivery (at work, after work, centralized [employees from several organizations meet in a location outside from work], or not specified), and practice time at home. The type of treatment was assigned to the following categories: (a) mindfulness training (MT) with yoga, (b) MT with relaxation, (c) MT with psychoeducation and personal reflection, (d) MBSR (original and adapted scripts), (e) meditation practice, (f) MT with elements of ACT and/or MBCT, and (g) others.

Methodological Design

Binary codes were assigned on the handling of missing data via intention-to-treat (ITT) methods, the type of control group (wait-list, active, passive), and the length of the follow-up period (≤ 12 weeks or > 12 weeks after post-assessment).

Outcome Assessment

Primary outcome data were clustered by assigning originally reported constructs to review outcomes within the domains of (a) mindfulness, (b) stress and health impairments (perceived stress, subsyndromal symptoms, burnout, somatization & physical illness), (c) well-being (well-being/life satisfaction, compassion), (d) work-related outcomes (work engagement, productivity, job satisfaction), and (e) resilience (Table 1). Constructs that were assessed in less than four distinct intervention samples were excluded from analyses, i.e., aggression, job control, job security, self-esteem, and empathy. If a study reported more than one measure per review outcome, we controlled for dependencies by computing the weighted mean and pooled standard deviation (according to Cohen (1988), presented in Eqs. (1) and (2)).
$$ {M}_{\mathrm{pooled}}=\frac{M_1\ast {n}_1+{M}_2\ast {n}_2}{n_1+{n}_2} $$
(1)
$$ {\mathrm{SD}}_{\mathrm{pooled}}=\sqrt{\frac{\left({n}_1-1\right)\ast {SD}_1^2+\left({n}_2-1\right)\ast {\mathrm{SD}}_2^2}{n_1+{n}_2-2}} $$
(2)
Table 1
Development of review outcomes and theoretical domains deducted from originals reported constructs and questionnaires from primary studies
Domain
Review outcome
Original reported constructs
Mindfulness
Mindfulness
Mindfulness
Mental well-being
Well-being and life satisfaction
(Psychological) Well-being
Life satisfaction
Quality of life
Orientation to life
Relaxation disposition
Vigor
Positive affect
Compassion
Self-compassion
Occupational self-compassion
Compassion for others
Stress and health impairment
Stress
(Job) stress
(Job) stressors
(Job) Demands
Traumatic stress
Need for recovery
(Job) Strain
Work family conflict
Work home interaction
Work life conflict
Subsyndromal symptoms
Anxiety
Psychological distress
Depression
Sleep quality/impairment
(Job) Rumination
(Job) Fatique
Negative affect
Worry
Alcohol abuse
Suicidal ideation
Burnout
Emotional exhaustion
Depersonalization
Personal accomplishment
Distancing from work
Personal burnout
Work-related burnout
Client related burnout
Global burnout
Somatization and physical illness
Physical symptoms
Somatization
Somatic health
Work-related outcomes
Work engagement
Vigor for work
Work Engagement
Productivity
Health-related lost days total
Work performance
Cognitive failure
Errors
Productivity loss
Phone calls (call center)
Job Satisfaction
Job satisfaction
Work life satisfaction
Resilience
Resilience
Resilience

Computation of Effect Sizes

As a dependent variable, we computed the standardized mean difference scores between the intervention and control groups (Hedges’ g = [mMindfulness Group mControl Group]/sdpooled). For each review outcome and each time point of assessment (post-intervention, follow-up), a g-score was built, with higher values indicating higher scores in the intervention groups (conventions for interpretation: g = 0.2 small effect, g = 0.5 medium effect, g = 0.8 large effect; Hedges and Olkin 1985). To account for the high heterogeneity of endpoints within each outcome, we used random-effects models to synthesize g-scores (Raudenbush 1994). The variability in effect size estimates was estimated using the restricted maximum likelihood estimator (REML; Viechtbauer 2005). For sensitivity analyses, influential case diagnostics were computed using Cook’s distances (Viechtbauer and Cheung 2010). If applicable, additional analyses without the outliers were performed for comparison.
Heterogeneity was assessed using the index I2 (Higgins and Thompson 2002) and tested with Cochran’s Q statistic (Cochran 1954), as recommended by the Cochrane Collaboration (Higgins and Green 2008). The I2 is a descriptive measure that displays the proportion of total variability, which can be attributed to heterogeneity among the true effects (Viechtbauer 2010). The conventions for interpretation are I2 = 25% small, I2 = 50% medium, and I2 = 75% high heterogeneity (Higgins et al. 2003). Exploratory moderator analyses were conducted on review outcomes indicating a moderate to high degree of heterogeneity if ≥ 10 primary effect sizes were available (as recommended by Pincus et al. 2011). Categorical moderators were investigated using subgroup analyses (e.g., profession) and continuous moderators via meta-regression (e.g., age). All statistical analyses were performed with R version 3.2.4 (R Development Core Team 2016) using the metafor package (Viechtbauer 2010).

Risk of Bias

Funnel plots were graphed for the visual inspection of publication bias. Statistical analysis of funnel plot asymmetry was conducted with Egger’s regression test (Egger et al. 1997; Sterne et al. 2005). Primary studies were rated with the Cochrane Collaboration’s tool for assessing the risk of bias in randomized trials (Higgins et al. 2011) on the following domains: sequence generation, allocation concealment, incomplete outcome data, and selective outcome reporting. The domain “blinding of participants, personnel, and outcome assessors” was excluded, as blinding is not applicable in studies evaluating psychosocial interventions.

Results

The systematic search in the electronic databases yielded K = 3915 articles (Fig. 1). Duplicates were removed (k = 970), and 2718 studies were excluded during the abstract screening. Reasons for exclusion in the full-text screening (k = 171) were (1) other population (k = 31), (2) other intervention (k = 15), (3) no intervention offered (k = 14), (4) no randomized control trial or control group (k = 55), (5) statistical information not fully reported (k = 27), or (6) other reasons (k = 29). In total, K = 56 articles were included, reporting data from k = 53 studies with i = 57 independent intervention samples (see Table 2 and Appendix A for study descriptions).
Table 2
RCT studies included in this meta-analysis
Authors (year)
Mindfulness program type
Control group
Number of participants mindfulness; control group
Profession
Duration in weeks
Delivery
Outcome domains
Country
Aikens et al. (2014)
Short adaption of MBSR [d]
Wait-list
44; 45
Mixed
7
Online
Mindfulness
Resilience
Stress
Work engagement
USA
Alexander et al. (2015)
MT and Yoga [a]
Wait-list
20; 20
Health care
8
In-class
Burnout
Mindfulness
USA
Allexandre et al. (2016)
MT combined with relaxation practices [b]
Wait-list
54, 70; 37
Call center
8
Online, blended(online, group meetings)
Burnout
Mindfulness
Productivity
Stress
Well-being
USA
Amutio et al. (2015a, 2015b)
MBSR [d]
Wait-list
21; 21
Health care
8
In-class
Burnout
Mindfulness
Spain
Ancona and Mendelson (2014)
MT and Yoga [a]
Wait-list
21; 22
Teaching
3
In-class
Burnout Stress
USA
Anderson et al. (1999)
Mantra-Meditation [e]
Wait-list
45; 46
Teaching
5
In-class
Burnout
Stress
Subsyndrom. symptoms
USA
Arredondo et al. (2017)
MT combined with compassion [g]
Wait-list
21; 19
Mixed
8
In-class
Burnout
Mindfulness
Stress
Compassion
Spain
Asuero et al. (2014)
MT with psychoeducation and personal reflection [c]
Wait-list
43; 25
Health care
8
In-class
Burnout
Mindfulness
Subsyndrom. symptoms
Well-being
Spain
Auserón et al. (2018)
MBSR combined with compassion [d]
Wait-list
25; 23
Health care
8
In-class
Mindfulness
Stress
Compassion
Spain
Baby et al. 2019
MBSR, MBCT, ACT combined [f]
Active (communication training)
63; 64
Health care
4
Online
Subsyndrom. symptoms
New Zealand
Bartlett et al. (2017)
Mindfulness at work program [g]
Active (information group)
20; 115
Public administration
5
In-class
Mindfulness
Productivity
Stress
Subsyndrom. symptoms
Well-being
Australia
van Berkel et al. (2014)
MT with psychoeducation and personal reflection [c]
Wait-list
129; 127
Science
16
Blended (in-class, e-coaching)
Mindfulness
Stress
Subsyndrom. symptoms
Work engagement
Netherlands
Bostock et al. (2018)
MT meditation App [e]
Wait-list
128; 110
Mixed
7
Online (app)
Stress
Subsyndrom. symptoms
Well-being
UK
Cheema et al. (2013)
MT and Yoga [a]
Passive
18; 19
Mixed
10
In-class
Job satisfaction
Subsyndrom. symptoms
Well-being
Australia
Chin et al. (2019) & Slutsky et al. (2018)
MT [g]
Active (single day mindfulness)
31; 29
Marketing
6
Blended (workshop, audio, online)
Job satisfaction
Subsynd. symptoms
Well-being
Stress
USA
Christopher et al. (2018)
Adaption of MBSR [d]
Wait-list
31; 30
Law enforcement
8
In-class
Burnout
Compassion
Mindfulness
Resilience
Stress
Subsyndrom. symptoms
USA
Crain et al. (2017)
Adaption of MBSR [d]
Wait-list
54; 59
Teaching
8
In-class
Job satisfaction
Mindfulness
Subsyndrom. symptoms
Well-being
USA/ Canada
Dwivedi et al. (2015)
MT and Yoga [a]
Active (management lectures and physical exercise)
80; 80
Industry
10
In-class
Well-being
India
Flaxman and Bond (2010)
MT combined with ACT practices [f]
Wait-list
177; 134
Mixed
2
In-class
Subsyndrom. symptoms
UK
Flook et al. (2013)
MBSR [d]
Wait-list
10; 8
Teaching
8
In-class
Burnout
Mindfulness
Compassion
Subsyndrom. symptoms
USA
Grégoire and Lachance (2015)
Short meditations [e]
Wait-list
24; 25
Call center
5
 Audio
Mindfulness
Stress
Subsyndrom. symptoms
Canada
Harris et al. (2016)
MT and Yoga [a]
Wait-list
34; 30
Teaching
16
In-class
Burnout
Mindfulness
Somatization
Stress
Subsyndrom. symptoms
Well-being
USA
Huang et al. (2015)
Adaption of MBSR [d]
Wait-list
72; 72
Industry
8
In-class
Stress
Subsyndrom. symptoms
Taiwan
Ireland et al. (2017)
MBSR, MBCT, ACT combined [f]
Active (1 h extra break/week)
23; 21
Health care
10
In-class
Burnout stress
Australia
Jennings et al. (2013)
MT with psychoeducation and personal reflection [c]
Wait-list
25; 25
Teaching
16
In-class
Burnout
Mindfulness
Somatic health
Subsyndrom. symptoms
Well-being
USA
Klatt et al. (2009)
Short version of MBSR [d]
Wait-list
22; 20
Mixed
6
In-class
Mindfulness
Stress
Subsyndrom. symptoms
USA
Klatt et al. (2017)
MT and Yoga [a]
Wait-list
27; 30
Finance
8
In-class
Stress
Subsyndrom. symptoms
Work engagement
Denmark
Lacerda et al. (2018)
MT with psychoeducation & personal reflection [c]
Wait-list
22; 22
Mixed
8
In-class
Mindfulness
Stress
Subsyndrom. symptoms
Brazil
Lin et al. (2019)
MBSR, MBCT combined [f]
Wait-list
55; 55
Health care
8
In-class
Job satisfaction
Resilience
Stress
Subsyndrom. symptoms
Well-being
China
Mackenzie et al. (2006)
Short version of MBSR [d]
Wait-list
16; 14
Health care
4
In-class
Burnout
Job satisfaction
Well-being
Canada
Manotas et al. (2014)
Short version of MBSR [d]
Wait-list
66; 65
Health care
4
In-class
Mindfulness
Somatic health
Stress
Subsyndrom. symptoms
Columbia
McConachie et al. (2014)
MT combined with ACT practices [f]
Wait-list
78; 78
Health care
1
In-class
Stress
Subsyndrom. symptoms
Well-being
Scotland
Mistretta et al. (2018)
MT combined with ACT practices [f]
Active (diary and sleep monitoring)
22; 15
Health care
6
In-class
Burnout
Compassion
Stress
Subsyndrom. symptoms
Well-being
USA
Molek-Winiarska and Żołnierczyk-Zreda (2018)
MBSR [d]
Wait-list
32; 34
Industry (mine workers)
10
In-class
Somatic health
Stress
Subsyndrom. symptoms
Poland
Querstret et al. (2017)
MBSR, MBCT combined [f]
Wait-list
63; 64
Mixed
4
Online
Mindfulness
Subsyndromal symptoms
UK
Rao et al. (2017)
MT and Yoga [a]
Passive
30; 30
Teaching
4
In-class
Stress
Subsyndrom. symptoms
India
Rexroth et al. (2017) & Michel et al. (2014)
MBSR, MBCT combined [f]
Wait-list
208; 204
Mixed
3
Online
Burnout
Job satisfaction
Mindfulness
Stress
Subsyndrom. symptoms
Well-being
Germany
Roeser et al. (2013)
MT combinded with compassion [g]
Wait-list
54; 59
Teaching
8
In-class
Burnout
Mindfulness
Compassion
Stress
Subsyndrom. symptoms
USA/ Canada
Schroeder et al. (2016)
MBSR with Compassion [d]
Wait-list
16; 17
Health care
4
In-class
Burnout
Compassion
Mindfulness
Resilience
Stress
USA
Sheppard et al. (1997)
Transcendental meditation [e]
Active (corporate stress management)
22; 22
Public admin
12
In-class
Subsyndrom. symptoms
USA
Shonin et al. (2014)
Meditation Awareness Training [e]
Active (psychoeducation)
76; 76
Mixed
8
Blended (inclass, phone, video, 1-1call)
Job satisfaction
Productivity
Stress
Subsyndrom. symptoms
UK
Singh et al. (2018)
Meditation [e]
Active (positive behavior support)
60; 63
Health care
10
In-class
Burnout
Stress
Well-being
USA
Song and Lindquist (2015)
MBSR [d]
Wait-list
21; 23
Health care
8
In-class
Mindfulness
Stress
Subsyndrom. symptoms
South Korea
Steinberg et al. (2017)
MT and Yoga [a]
Wait-list
18; 18
Health care
8
In-class
Well-being
USA
Strub and Tarquinio (2013)
MBCT [f]
Wait-list
10; 10
Industry
8
In-class
Burnout
Somatization
Stress
Subsyndrom. symptoms
Luxemburg
Tagg (2016)
MBSR techniques [g]
Active (applied behavior analysis)
35; 35
Health care
1
In-class
Burnout
stress
USA
Taylor et al. (2016)
MBSR with compassion [d]
Wait-list
26; 30
Teaching
9
In-class
Stress
Canada
Valley and Stallones (2017)
MBSR [d]
Wait-list
11; 12
Health care
8
In-class
Mindfulness
productivity
USA
Verweij et al. (2018)
MBSR [d]
Wait-list
80; 68
Health care
8
In-class
Burnout
Mindfulness
Productivity
Compassion
Stress
Subsyndromal symptoms
Well-being
Netherlands
Wilson (2012)
MBAP (mindful art processing) [g]; Short version of MBSR [d]
Wait-list
27, 26; 27
Mixed
8
In-class
Mindfulness
Stress
Subsyndrom. symptoms
Well-being
Work engagement
USA
Wolever et al. (2012)
Meditation [e]; meditation (online) [e]; MT and Yoga [a]
Passive
44, 52, 90; 53
Finance
12
In-class, online
Mindfulness
Productivity
Stress
Subsyndrom. symptoms
USA
Yang et al. (2018)
MBSR [d]
Active (routine psychological support)
50;50
Health care
8
In-class
Stress
Subsyndrom. symptoms
China
Żołnierczyk-Zreda et al. (2016)
MT with psychoeducation and personal reflection [c]
Wait-list
72; 72
Finance
8
In-class
Somatization
Stress
Subsyndrom. symptoms
Poland
Treatment categories: [a] mindfulness training (MT) with yoga, [b] MT with relaxation, [c] MT with psychoeducation and personal reflection, [d] MBSR (original and adapted scripts), [e] meditation practice, [f] MT with elements of ACT and/or MBCT, [g] others
Programs: ACT acceptance commitment therapy. MBAP mindfulness-based art processing. MBCT mindfulness-based cognitive therapy, MT mindfulness training, MBSR mindfulness-based stress reduction

Characteristics of Primary Studies

The primary studies covered a broad range of programs offered in different settings for a variety of occupational groups. The program types most frequently investigated were MBSR (32%), followed by MT combined with yoga (16%), MT with elements of ACT and/or MBCT (16%), and meditation practice (14%). On average, the programs involved 16.9 h of attendance (SD = 12.6) and were offered over a period of 1 to 16 weeks, with an average time span of 7.5 weeks (SD = 3.3). Most programs were delivered in-class (i = 45, 79%), followed by online programs (i = 7), combinations of online and in-class elements (i = 4; blended), or via audio records (i = 1). The most frequent location was the workplace (i = 39, 68%); only few programs were offered off-site (i = 4) or after work (i = 2). Location of delivery was not explicitly reported for i = 12 programs. Home practices were recommended in all programs, for which information on this coding category was reported (i = 48, 84%).
Overall, the primary studies included 5161 participants, of which 2689 were enrolled in MBPs and 2472 were assigned to control groups. Participants were between 19.5 and 50.5 years old (m = 40.13, SD = 7.00, k = 46) and had an average level of education roughly corresponding to a Bachelor’s degree (m = 15.45 years of education, SD = 0.86; k = 16). On average, the samples included 73% women (k = 50) and differed largely with regard to participant’s work experience, ranging from nursing students just starting their professional education (Song and Lindquist 2015) to health care professionals with an average of 24 years of experience (m = 11.51, SD = 6.50, k = 20).
Most of the 53 studies investigated health care employees (k = 19, 36%), followed by teachers (k = 9, 17%) and employees in the industrial (k = 4) and finance sector (k = 3). Two studies each were conducted in public administration and call centers; one study each in science, law enforcement, and marketing. In 11 studies (21%), the MBP was offered to all employees within an organization, irrespective of professional groups. About one-third of the studies were conducted in the USA (k = 22, 42%), followed by the UK (k = 4, 8%) and Spain (k = 4, 8%). The remaining studies were performed in a variety of countries across the globe: three studies each in Canada and Australia; two studies each in the Netherlands, India, China, Poland; one study each in Germany, Taiwan, Denmark, Columbia, South Korea, Luxembourg, Brazil, and New Zealand.
In their study design, 79% of the studies compared intervention effects to passive control or wait-list control groups (k = 42). ITT methods were reported to analyze data in less than half of the studies (k = 21, 40%). Follow-up data up for a period up to 12 weeks after post-measurement was reported in 18 studies (34%), with a mean time lag of 9.11 weeks (SD = 3.58). Only seven studies (13%) included longer follow-up periods, ranging from 16 weeks to 3 years (m = 46.12, SD = 48.91), of which two did not report between-group effect sizes because the wait-list controls had participated in the program by the time of follow-up assessment. Consequently, none of the review outcomes contained sufficient data for a meta-analytical synthesis of longer follow-up periods.

Meta-Analytical Synthesis and Sensitivity Analyses of Effects

The meta-analyses of post-intervention effects yielded significant effects in the intended direction across all review outcomes (Table 3, forest plots and funnel plots are presented in Appendix B). The number of primary effect sizes contained in the respective syntheses varied widely, ranging from k = 43 studies reporting on perceived stress, to k = 4 on resilience. The programs significantly raised the mindfulness of participants (g = 0.44, p < .001; k = 32), but strongest effects resulted for the more distal outcomes well-being/life satisfaction (g = 0.68, p = .002; k = 22) and perceived stress (g = −0.66, p < .001; k = 43). Work-related effects were assessed in comparatively few studies, yet showing significant changes in work engagement (g = 0.53, p = .022; k = 5), job satisfaction (g = 0.48, p = .021, k = 7), and productivity (g = 0.35, p = .036, k = 9).
Table 3
Comparison of the mindfulness program and control groups at different assessment times
 
Post (M = 8.42, SD = 5.18 weeks)
Follow-up (≤ 12 weeks)
Domain/review Outcome
k
g
CI
I2
k
g
CI
I2
Mindfulness
  Mindfulness
32
0.44***
[0.32; 0.56]
52.4
11
0.45***
[0.22; 0.68]
62.1
Mental well-being
        
  Well-being and life satisfaction
22
0.68**
[0.24; 1.12]
95.3
9
0.40***
[0.22; 0.58]
26.1
  Compassion
8
0.61***
[0.37; 0.85]
30.7
5
0.54**
[0.20; 0.88]
41.5
Stress and health impairment
  Perceived stress
43
− 0.66***
[− 0.88; − 0.44]
89.8
15
− 0.77***
[− 1.06; − 0.48]
82.7
  Subsyndromal symptoms
40
− 0.56***
[− 0.79; − 0.33]
91.5
14
− 0.69**
[− 1.03; − 0.34]
90.7
  Burnout
22
− 0.37**
[− 0.61; − 0.14]
78.2
9
− 0.38***
[− 0.58; − 0.19]
25.3
  Somatization/physical illness
6
− 0.32*
[− 0.58; − 0.06]
38.5
    
Work outcomes
  Work engagement
5
0.53*
[0.08; 0.98]
80.3
    
  Productivity
9
0.35*
[0.02; 0.68]
79.7
    
  Job satisfaction
7
0.48*
[0.07; 0.89]
83.9
    
Resilience
  Resilience
4
0.49***
[0.24; 0.73]
0
    
k number of trials, g standardized mean difference scores (Hedges’ g), CI 95% confidence intervals, I2 heterogeneity statistics, M mean score, SD standard deviation
***p < . 001; **p < .01; *p < .05
Sensitivity analyses of post-intervention effects revealed influential cases (outliers) in all outcome categories, except for mindfulness and compassion (outlier analyses are presented in Appendix B). After the exclusion of outliers, results still indicated significant between-group differences for all outcomes in the domains mental well-being and stress/health impairment, with effect sizes decreasing within a range of 0.07 (stress and burnout) to 0.17 (well-being/life satisfaction). Among work-related outcomes, only the effect on job satisfaction remained significant in the amended analyses. The positive effect size for productivity dropped considerably in strength and below the level of significance (g = 0.15, p = .061, k = 8) after removing the outlier, a study on meditation awareness training in a sample of office-based middle-hierarchy managers (Shonin et al. 2014). For resilience and work engagement, no amended analyses were conducted, because less than four studies remained after the exclusion of outliers.
Effects for follow-up assessments up to 12 weeks after the completion of MBPs were only reported in 18 studies (34%), which in sum did not provide enough data to analyze effects on somatization/physical illness, resilience, and work-related outcomes (k < 4). All other outcome categories yielded significant effects in the intended direction, with effect sizes comparable to post-assessment (see Table 3). Largest effects resulted for perceived stress (g = − 0.77, p < .001; k = 15) and subsyndromal symptoms (g = − 0.69, p < .001; k = 14). Sensitivity analyses detected influential cases in the categories perceived stress and subsyndromal symptoms. The exclusion of those outliers lowered the effect sizes by 0.11 and 0.15, respectively, but did not affect the significance of results (subsyndromal symptoms: stress: g = − 0.66, p < .001, k = 13; g = − 0.54, p < .001, k = 14).

Exploratory Moderator Analyses

Exploratory moderator analyses were conducted for the review outcomes mindfulness, well-being/life satisfaction, stress, subsyndromal symptoms, and burnout (see Table 3; Pincus et al. 2011). Overall, the results revealed no consistent moderating effects for any characteristics of populations, programs, and methods. Some variables significantly influenced effects on individual outcomes: Programs involving more hours of attendance yielded larger effects in mindfulness (Q[1] = 5.11, p = .024, k = 30), burnout (Q[1] = 12.85, p < .001, k = 21), and well-being/life satisfaction (Q[1] = 7.75, p = .005, k = 21). The sample characteristics gender and occupational profession significantly moderated effects on well-being/life satisfaction (gender: Q[1] = 6.76, p = .009, k = 22; profession: Q[7] = 21.39, p = .003, k = 22), with larger effect sizes in samples including more male participants, and employees in the financial sector. Participants’ level of education significantly moderated effects on well-being/life satisfaction and subsyndromal symptoms, indicating larger effects for higher educated participants (well-being Q[1] = 6.12, p = .013, k = 5; subsyndromal symptoms Q[1] = 10.02, p = .002, k = 14), whereas higher work experience was associated with larger effects in mindfulness (Q[1] = 6.13, p = .013, k = 12) and burnout (Q[1] = 8.67, p = .003, k = 10). No significant moderator effects were observed for age of participants, type of program, time span in weeks, method and location of delivery, recommended hours of practice at home, type of control group, ITT samples, or publication date (see Appendix C for detailed results).

Risk of Bias

Statistical testing for funnel plot asymmetry indicated a potential publication bias for the review outcomes perceived stress (t[41] = − 2.61, p = .013) and mindfulness (t[30] = 2.88, p < .01). Ratings of risk of bias domains are presented in Fig. 2 (see Appendix D for detailed ratings). Most “high-risk” ratings were assigned in the categories “incomplete outcome data” and “other biases” (k = 11 out of 53 each). Risks of bias regarding outcome data either concerned unexplained attrition/exclusion of participants or a discrepancy between the number of participants and corresponding figures in the statistical analyses (e.g., degrees of freedom). Within the category “other bias,” six primary studies reported baseline imbalances, which might have affected outcomes, four included a selective sample of employees with poor mental health and in one some participants changed groups (control to MBP and vice-versa) and were not excluded from the analysis. Three studies were rated as high risk in the category “selective reporting” because they did not report data for at least one of the outcome scales listed in the “Method” section. Five studies were rated as high risk in the category “random sequence generation” because non-random components in the sequence-generation process were described (e.g., volunteering participants in their preferred groups, no full randomization possible because of vacation and schedule issues). The majority of studies did not report in sufficient detail on sequence generation (k = 24) and allocation concealment (k = 45).

Discussion

This meta-analysis systematically analyzed the effects of mindfulness-based programs on different outcomes in occupational settings. In total, 56 articles with n = 2689 program participants and n = 2472 employees in control groups were included. Our analyses indicate that mindfulness in the workplace effectively reduces perceived stress and health complaints while improving well-being and work-related outcomes (work engagement, productivity, job satisfaction)—all with small to medium effect sizes ranging from g = 0.32 to 0.68 shortly after completing the program. Effects were maintained in follow-up assessments up to 3 months later, with effect sizes ranging from g = 0.38 to 0.77. Sensitivity analyses confirmed the robustness of findings by still yielding significant effects after excluding primary studies identified as outliers, with one exception (i.e., effects on productivity) and two outcomes not allowing further analyses due to the low number of primary effect sizes (i.e., effects on resilience and work engagement). Heterogeneity of synthesized effect sizes was medium-to-high for the majority of review outcomes, but not explained consistently by population or program characteristics in the moderator analyses.
Our results support the conclusion of previous qualitative and quantitative reviews that mindfulness training in the workplace improves the well-being and health of participants (e.g., Eby et al. 2019; Janssen et al. 2018; Lomas et al. 2017a). Between-group effect sizes were largest for the review outcomes well-being/life satisfaction (g = 0.68) and stress (g = −0.66) and comparable in strength to those reported in meta-analyses of MBPs in healthy samples outside the occupational context (Hendriks et al. 2017; Jayawardene et al. 2017; Khoury et al. 2015; Spijkerman et al. 2016). Due to the strong increase in published RCTs in the years 2016 to 2018, this meta-analysis extends two recently published meta-analyses (Bartlett et al. 2019; Lomas et al. 2019) by breadth of information. Our database was large enough to pool effect sizes for follow-up assessments and to perform analyses on review outcomes for which previously not enough primary effect sizes had been reported, namely resilience (g = 0.49), job satisfaction (g = 0.48), work engagement (g = 0.53), productivity (g = 0.35), and somatization (g = 0.32). In the interpretation of results, some differences have to be considered. Compared to our inclusion criteria, Lomas et al. (2019) applied a broader scope by including student populations (k = 35), while Bartlett et al. (2019) focused on “pure” MBPs delivered at the workplace (k = 23). Our analyses were based on 56 RCTs, of which 20 were included in Lomas et al. (2019) and 15 in Bartlett et al. (2019), yielding a 65% overlap of primary studies each. Noticeably, the major reason for the discrepancies was a lack of statistical information in the publication of study results, which we requested in vain the authors. Despite these differences, results largely corresponded in synthesized effect sizes for mindfulness (g = 0.44; gLomas et al. = 0.39; gBartlett et al. = 0.45), perceived stress (g = − 0.66; gLomas et al. = − 0.60; gBartlett et al. = − 0.56), subsyndromal symptoms (g = − 0.48; gLomas et al. = − 0.48 to −0.57; gBartlett et al. = − 0.38 to − 0.69), and burnout (g = − 0.37, gLomas et al. = − 0.36; gBartlett et al. = − 0.16 to − 0.52). Effect sizes were larger in our analyses for well-being (g = 0.68; gLomas et al. = 0.36; gBartlett et al. = 0.46) and compassion (g = 0.61; gLomas et al. = 0.42).
Empirical evidence on the proposed improvements in workplace functioning, performance, and productivity is still limited, although these outcomes are frequently discussed in scientific literature (e.g., Hyland et al. 2015) and most likely present decisive arguments for implementing MBPs in for-profit organizations (e.g., Greiser and Martini 2018). Work-related outcomes were only assessed in a small number of primary studies (k = 16), and caution must be applied in the extrapolation of results. In the main analyses, MBPs yielded significant positive effects on all three review outcomes—job satisfaction, work engagement, and productivity. However, only the increase in job satisfaction (g = 0.48) demonstrated to be robust in the sensitivity analyses. The effect on productivity (g = 0.35) was attributable to a single study on meditation awareness training in white-collar middle management (Shonin et al. 2014) and dropped below the level of significance among the remaining eight studies. The sensitivity analysis of work engagement (g = 0.53) identified two outlying studies, in which one observed no effects following a mindfulness-related multicomponent health promotion intervention (van Berkel et al. 2014) and one observed a comparatively larger effect after a mindfulness-based art processing intervention (Wilson 2012). Due to the small number of studies reporting on work engagement (k = 5), an amended analysis was not feasible for this outcome.
Effects on job satisfaction, work engagement, and productivity have not previously been synthesized meta-analytically as separate review outcomes. The preliminary nature of results is particularly pronounced in effects on productivity, due to the heterogeneous measures used to assess this outcome in the six primary studies reporting on this category. Two studies (partly) assessed productivity based on external indicators, yielding inconsistent results: Allexandre et al. (2016) report inconclusive patterns in company metrics for employee performance. Bartlett et al. (2017) investigated “health-related lost productive time” based on self-reported “absent days” and “inefficient days,” but only the latter significantly decreased. One study applied an observer-based instrument and found significant effects on work performance, as rated by participants’ direct line managers (Shonin et al. 2014). Three studies assessed effects on self-report questionnaires—along with all other primary outcomes included in this meta-analysis. Participating in a MBP did not improve the ability to perform job roles in one study (Wolever et al. 2012), yielded marginally significant reductions in medical error rate (Verweij et al. 2018), but significantly decreased cognitive failures (Valley and Stallones 2017).

Moderator Analyses

In the moderator analyses, none of the population, program or methodological characteristics explained heterogeneity systematically across review outcomes, which aligns with the findings of other reviews (e.g., Janssen et al. 2018). Regarding the program characteristics, neither the type of program nor aspects of delivery (in class vs. online, location) significantly influenced effects on any outcome. However, our analyses might have been underpowered to detect moderating effects. First, we did not confine our analysis to one specific mindfulness training method to account for the naturally occurring high variability of workplace-specific adaptations. Second, aspects of delivery are unequally distributed with 79% programs delivered in-class and 68% delivered on-site. Previous meta-analyses across contexts yield inconsistent results. Lomas et al. (2019) report larger effects on health-related outcomes for standardized MBSR versions, whereas Bartlett et al. (2019) and Bamber and Morpeth (2019) did not find any moderating effects for MBP type and content. A growing body of research suggests that particular training components, meditation techniques, and mindfulness practices contribute differentially to effects on some outcomes (e.g., Hunt et al. 2018; Kropp and Sedlmeier 2019). Two recent meta-analyses indicate that programs with elements of various informal and formal meditation practices yield larger effects on negative affectivity (Schumer et al. 2018) and weight loss (Carrière et al. 2018). Considering the high relevance of time-savings, accessibility, and cost-efficiency in occupational contexts, research on these differential effects might be of interest in workplace health promotion.
The analyses of treatment dosage concur with a previously reported pattern: In line with earlier reviews (Carmody and Baer 2009; Virgili 2015), the duration of programs in weeks was not directly related to their effectiveness. Hours of attendance on the other hand was significantly associated with higher improvements in mindfulness, well-being/life satisfaction and reduction of burnout symptoms, supporting the theoretical assumption that mindfulness requires a certain amount of practice (e.g., Bishop et al. 2004; Tang et al. 2015). Laboratory studies have suggested positive short-term effects of mindfulness inductions (Leyland et al. 2018). However, how much minimum training is required to yield sustainable effects remains uncertain. In a meta-analysis of 43 studies on MBSR and MBCT, the dose-response relationship was statistically significant, but unexpectedly small (Parsons et al. 2017); in an analysis of 15 RCT’s evaluating online programs, it seemed to be driven by an outlier (Spijkerman et al. 2016). Possibly, the dose-response relationship can only be understood in a more comprehensive model, including variables such as motivation, practice quality, or self-efficacy (e.g., Goldberg et al. 2019).
Moderator analyses for population characteristics include several possible biases that impede a conclusive interpretation of results. Effects on well-being/life satisfaction were significantly moderated by gender, education, and occupational profession; effects on subsyndromal symptoms by education; and effects on mindfulness and burnout by work experience. However, the effects of gender and profession on well-being/life satisfaction might be biased by the strong effect sizes of one singular study with a rather unusual sample of midlevel managers (50% male), which were recruited across 30 companies in the financial sector (Żołnierczyk-Zreda et al. 2016). In addition, results might be skewed by the unbalanced distribution of participant characteristics among primary samples, including an overrepresentation of women and participants with college degrees. Although these characteristics concur with the selective utilization of preventive health care (Dryden et al. 2012; Koopmans et al. 2012), they might rather be caused by the large number of samples working in health care (36%) and education (17%). The insignificant results regarding age might be methodologically biased. We applied a meta-analytical approach using summary statistics at the study level. Consequently, the moderator analysis on age tested whether the average age of participants within samples was associated with differences in effects between samples. Considering the multiple sources of heterogeneity across and within different occupational settings, the investigation of moderators among participant characteristics would require large multi-site trials including participants with different professional backgrounds and current occupations.
Among the formal characteristics of primary studies, neither the year of publication nor the analyzed methodological characteristics significantly moderated any of the review outcomes. In psychotherapy research, the potential moderating effect of publication date has been controversially discussed based on studies published 1977 to 2014 (Johnsen and Friborg 2015; Ljótsson et al. 2017). Considering that the earliest study included in our review had been published in 1997, the proposed influence of early research might not apply to research on MBPs in the occupational setting. The insignificant results for type of control group and methods for the handling of missing data align with previous reviews (e.g., Donaldson-Feilder et al. 2019; Khoury et al. 2017; Schumer et al. 2018) but deserve further attention. In our analyses, only 11 primary studies (21%) compared the MBPs to active control groups and less than half (k = 21, 40%) applied statistical methods to control for systematic biases in missing data. Both methods are common indicators for the methodological quality of intervention studies (e.g., Ruiz-Canela et al. 2000), because they yield a more realistic estimation of effectiveness, which is reflected in lower between-group effect sizes. Research on MBSR indicates rigorous active control groups can indeed yield comparable effects on outcomes other than mindfulness itself (e.g., MacCoon et al. 2012). Thus, more research is needed to identify possible unique effects of mindfulness training compared to other effective workplace health promotion programs (c.f. Goetzel et al. 2014).

Limitations and Future Research

Although we conducted this review according to state-of-the-art meta-analytic methods, our results are subject to several inherent limitations. We applied a broad search strategy and contacted authors to minimize publication bias among the included primary studies. For most review outcomes, no graphical or statistical funnel plot asymmetry was detected. However, potential publication bias was observed for the effects on mindfulness and perceived stress. Results regarding these two review outcomes should therefore be interpreted with special caution, as the observed effect size might be overestimated.
The quality of primary studies was evaluated with the Cochrane Collaboration tool for assessing the risk of bias (Higgins et al. 2011). The majority of studies did not imply a high risk of bias in any of the categories, indicating an acceptable overall quality of primary studies. Most high-risk ratings were assigned in the category “incomplete outcome data” and “other biases” (k = 11, 21% of primary studies each), “random sequence generation” (k = 5) and “selective reporting” (k = 3). Risks of bias regarding outcome data either concerned unexplained attrition/exclusion of participants or discrepancies in the number of participants across text, tables, and statistical analyses. The category other biases included baseline imbalances between control and intervention group in variables related to outcome measures (k = 6), selective samples of employees with poor mental health (k = 4), and participants switching bi-directionally between control and intervention groups (k = 1). Risk of bias in random sequence generation was assigned mainly for manual modifications in the randomization process, such as adjusting for preferences, vacations, or schedule issues. The category “selective reporting” applied if no data were reported for at least one of the outcome scales mentioned in the methods section of an article. However, most studies did not or not in sufficient detail report on the sequence generation and the allocation concealment, resulting in a large proportion of ratings of “unclear risk of bias” in these categories. It would be beneficial to report on these aspects more precisely in future studies to facilitate the conductance and—more importantly—the interpretation of meta-analyses on health interventions.
Finally, data from primary studies was not sufficient to estimate effect sizes for long-term effects. Only seven of 53 included studies report a follow-up period of more than 12 weeks, whereby in two of these studies, the waiting list group had received the training by the time of assessment. A closer look at the results reveals a mixed picture. In some studies, the beneficial effects of mindfulness training were maintained or further improved over a period of 6 months (k = 3) or 1 and 3 years, respectively (each k = 1). One study reports only marginal between-group effects at 4 months after the program (k = 1); another study did not find any effects within 1 year (k = 1). The shortage of longer follow-up periods is not specific to the occupational context but applies to the evaluation of mindfulness programs across research areas, such as general mental health prevention (Khoury et al. 2015), clinical psychology (Galante et al. 2013; Singh and Gorey 2018; Strauss et al. 2014), physical health (Haller et al. 2017), and primary care (Demarzo et al. 2015).

Implications for Practice

For organizations and corporations that consider implementing mindfulness training into their occupational health management, our results provide evidence for its effectiveness in promoting personal health and well-being. Based on the available evidence, these generally positive effects seem to be applicable across professions and individual characteristics of participants, indicating that mindfulness training is feasible and scalable in a wide range of contexts.
However, our results do not offer conclusive answers to a variety of questions and concerns that have been raised (e.g., Hyland et al. 2015; Jamieson and Tuckey 2017). First, we only included studies evaluating mindfulness-based programs targeting individual employees. Current research suggests that organizational culture, the mindfulness of leaders, and other setting variables not only influence the collective mindfulness within corporations (Sutcliffe et al. 2016) but are also beneficially associated with individual outcomes (e.g., Pinck and Sonnentag 2017; Reb et al. 2015). These variables might also affect the perception and acceptance of individually oriented mindfulness training within occupational health strategies. In the worst case, if mindfulness training is offered as a “means to pacify disgruntled employees, maintain the status quo, and ultimately manage and manipulate the workforce” (Hyland et al. 2015, p.595), they might not be as effective as the results of these analyses suggest. Future studies should consider these environmental factors, which might facilitate or hinder mindfulness at different hierarchical levels within organizations.
Second, mindfulness has often been promoted as an approach to improve individual and organizational performance (e.g., Hyland et al. 2015). Some researchers base this assumption on promising results from cross-sectional research (see Mesmer-Magnus et al. 2017), others refer to hypothetical mechanisms of mindfulness (Good et al. 2016), and some build on the happy worker-productive worker thesis, suggesting that workers who experience high levels of well-being also perform well and vice-versa. Although a variety of performance and productivity outcomes have been studied in quasi-experimental and uncontrolled studies with inconsistent results (Lomas et al. 2017b), productivity measures have only rarely been included in RCTs and yielded no robust significant results in our analysis. Future studies should include measures targeting individual job and task performance directly, as well as measures contributing to a corporation’s overall productivity (e.g., presenteeism, absenteeism) to provide more robust data on whether mindfulness trainings are effective in increasing performance.
In summary, our meta-analysis shows solid evidence (k ≥ 22) that MBPs in the workplace have positive effects on perceived stress, subsyndromal symptoms, burnout, mindfulness and well-being, across different occupational groups and organizational structures. These effects seem to persist over a period of 3 months. In addition, our results show preliminary evidence of an increase in compassion, job satisfaction, work engagement, and resilience and a reduction in somatic complaints (k ≤ 8). Future studies should further investigate the potential effects of MBPs on work-related outcomes, in particular on performance and productivity measures (k = 9) and include active control groups in their study design.

Compliance with Ethical Standards

This research received no specific grant from any funding agency, commercial or not-for-profit sectors. This article does not contain any studies with human participants or animals performed by any of the author. This research is collecting and synthesizing data from previous trials, in which informed consent has already been obtained by the trial investigators.

Conflict of Interest

The authors declare that they have no conflict of interest.
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Metagegevens
Titel
Mindfulness-Based Programs in the Workplace: a Meta-Analysis of Randomized Controlled Trials
Auteurs
Ruben Vonderlin
Miriam Biermann
Martin Bohus
Lisa Lyssenko
Publicatiedatum
02-03-2020
Uitgeverij
Springer US
Gepubliceerd in
Mindfulness / Uitgave 7/2020
Print ISSN: 1868-8527
Elektronisch ISSN: 1868-8535
DOI
https://doi.org/10.1007/s12671-020-01328-3

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