The paper published by Robroek et al1 estimates the incidence of work disability attributed separately and jointly to obesity and to high physical job demands in a large longitudinal cohort of Swedish construction workers. This cohort has been well described previously and has important strengths, including a large representative sample of male workers in this sector.
For construction workers who participated in a programme offering periodic health examinations, height and weight, measured directly, were obtained from a first examination. The mean age of the 328 743 men at the time of first examination was 32 years of age. Approximately 29% were overweight (body mass index (BMI) 25–29) and 4% were obese (BMI >30). Physical workload measures were imputed from a job exposure matrix. Information on self-reported exposures of the frequency of lifting heavy loads and the frequency of working in bent or twisted working postures was obtained from 77 000 construction...
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