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Job strain in relation to body mass index: pooled analysis of 160,000 adults from 13 cohort studies.

par Nyberg, Solja T.;Casini, Annalisa ;Kittel, France ;Kivimäki, Mika; [et al.]
Référence Journal of internal medicine
Publication Publié, 2011

Article révisé par les pairs

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Résumé :

Background. Evidence of an association between job strain and obesity is mixed, mostly limited to small-scale studies, and does not distinguish between categories of underweight or obesity sub-classes. Objectives. To examine the association between job strain and body mass index (BMI) in a large adult population. Methods. We performed a pooled cross-sectional analysis based on individual-level data from 13 European studies resulting in a total of 161,746 participants (49% men, mean age 43.7 years). Longitudinal analysis with a median follow-up of 4 years was possible in 4 cohort studies (N=42,222). Results. Of the participants, 86,429 were normal weight (BMI 18.5 - 24.9 kg/m2), 2149 underweight (BMI < 18.5 kg/m2), 56,572 overweight (BMI 25.0 - 29.9 kg/m2), and 13,523 class I (BMI 30 - 34.9 kg/m2) and 3073 classes II-III (BMI > 35 kg/m2) obese. In all, 27,010 (17%) participants reported job strain. In cross-sectional analyses, we found increased odds of job strain among underweight (odds ratio 1.12, 95% confidence interval 1.00 to 1.25), obese class I (1.07, 95% confidence interval 1.02 to 1.12) and classes II-III participants (1.14, 95% confidence interval 1.01 to 1.28) as compared with normalweight participants. In longitudinal analysis, both weight gain and weight loss were related to the onset of job strain during follow-up. Conclusions. In an analysis of European data, we found both weight gain and weight loss to be associated with the onset of job strain, a finding which is consistent with the 'U'-shaped cross-sectional association between job strain and BMI.