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Psychometric Evaluation of the IWQOL-Lite (Spanish Version) When Applied to a Sample of Obese Patients Awaiting Bariatric Surgery

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Abstract

Background

Obesity may have an impact on key aspects of health-related quality of life (HRQOL). In this context, the Impact of Weight Quality of Life (IWQOL) questionnaire was the first scale designed to assess HRQOL. The aim of the present study was twofold: to assess HRQOL in a sample of Spanish patients awaiting bariatric surgery and to determine the psychometric properties of the IWQOL-Lite and its sensitivity to detect differences in HRQOL across groups.

Methods

Participants were 109 obese adult patients (BMI ≥ 35 kg/m2) from Barcelona, to whom the following measurement instruments were applied: IWQOL-Lite, Depression Anxiety Stress Scales, Brief Symptom Inventory, and self-perception items.

Results

Descriptive data regarding the IWQOL-Lite scores obtained by these patients are reported. Principal components analysis revealed a five-factor model accounting for 72.05% of the total variance, with factor loadings being adequate for all items. Corrected item–total correlations were acceptable for all items. Cronbach’s alpha coefficients were excellent both for the subscales (0.88–0.93) and the total scale (0.95). The relationship between the IWQOL-Lite and other variables supports the construct validity of the scale. Finally, sensitivity analysis revealed large effect sizes when comparing scores obtained by extreme BMI groups.

Conclusions

This is the first study to report the application of the IWQOL-Lite to a sample of Spanish patients awaiting bariatric surgery and to confirm that the Spanish version of the instrument has adequate psychometric properties.

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Conflict of Interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Methodology for the Behavioural Sciences, University of Barcelona, Passeig Vall d’Hebron, 171, 08035, Barcelona, Spain

    Ana Andrés

  2. Department of Personality, Assessment and Psychological Treatment, University of Barcelona, Passeig Vall d’Hebron, 171, 08035, Barcelona, Spain

    Carmina Saldaña

  3. Institute for Research on the Brain, Cognition and Behavior (IR3C), University of Barcelona, Barcelona, Spain

    Carmina Saldaña

  4. Obesity Unit, Endocrinology and Nutrition Service, Hospital Universitari Vall d’Hebron, Passeig Vall d’Hebron, 119-129, 08035, Barcelona, Spain

    Jordi Mesa & Albert Lecube

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  1. Ana Andrés
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  2. Carmina Saldaña
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  4. Albert Lecube
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Correspondence to Ana Andrés.

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Andrés, A., Saldaña, C., Mesa, J. et al. Psychometric Evaluation of the IWQOL-Lite (Spanish Version) When Applied to a Sample of Obese Patients Awaiting Bariatric Surgery. OBES SURG 22, 802–809 (2012). https://doi.org/10.1007/s11695-011-0518-7

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  • DOI: https://doi.org/10.1007/s11695-011-0518-7

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