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01-04-2015 | Uitgave 4/2015

Quality of Life Research 4/2015

Construct validity of SF-6D health state utility values in an employed population

Tijdschrift:
Quality of Life Research > Uitgave 4/2015
Auteurs:
Siyan Baxter, Kristy Sanderson, Alison Venn, Petr Otahal, Andrew J. Palmer

Abstract

Background

Health utility values permit cost utility analysis in workplace health promotion; however, utility measures of working populations have not been validated.

Aim

To investigate construct validity of SF-6D health utility in a public service workforce.

Methods

SF-12v2 Health Survey was administered to 3,408 randomly selected public service employees in Australia in 2010. SF-12 scores were converted to SF-6D health utility values. Associations and correlates of SF-6D with health, socio-demographic and work characteristics [comorbidities, body mass index (BMI), Kessler-10 psychological distress (K10), education, salary, effort-reward imbalance (ERI), absenteeism] were explored. Ceiling effects were analysed. Nationally representative employee SF-6D values from the Household, Income and Labour Dynamics in Australia (HILDA) survey (n = 11,234) were compared. All analyses were stratified by sex.

Results

Mean (SE) age was 45.7 (0.35) males; 44.5 (0.22) females. Females represented 72 % of the sample. Mean (SE) health utility 0.792 (0.004); 0.771 (0.003) was higher in males. SF-6D demonstrated both a significant inverse association (p < 0.01) and negative correlations (female; male) with K10 (r = −0.63; r = −0.66), comorbidity count (r = −0.40; r = −0.33), ERI (r = −0.37; r = −0.34) and absenteeism (p < 0.005, r = −0.25; r = −0.21). Mean (SE) SF-6D in HILDA was 0.792 (0.002); 0.775 (0.003) males; females. Correlates and associations in all samples were similar. The general employed demonstrated a significant inverse association with age and positive association with salary. SF-6D was independent of BMI.

Conclusions

Psychological distress, comorbidity, effort-reward imbalance and absenteeism are negatively associated with employee health. SF-6D is a valid measure of perceived health states in working populations.

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