1. Although many people who leave physically strenuous occupations do so for reasons unrelated to health, there are quite a few who change because they are no longer able to carry out heavy work or possibly because they consider heavy work is dangerous to their health. What happens to those who are no longer fit enough to continue in their heavy jobs? Some of them, in more serious cases, will probably leave the workforce partly or entirely and some of them will continue working in physically less strenuous occupations. These lighter occupations might therefore, especially in cross-sectional data, show an 'undeservedly' high morbidity. The aim of the present study was to investigate the possible responsibility of previous heavy work for health problems at a Fox AJ, Collier PF. Low mortality rates in industrial cohort studies due to selection for work and survival in the industry;Br J Prev Soc Med,1976
2. Obtaining occupational exposure histories in epidemiologic casecontrol studies;Gerin, M.; Siemiatycky, J.; Kemper, H.; Begin, D.;JOM; Completeness of occupational history and occurences of work-related diseases,1985
3. Turnover and health selection among foundry workers;Koskela, R.-S.; Luoma, K.; Hernberg, S.;ScandJ Work Environ Health
4. Time-related factors as potential confounders and effect modifiers in studies based on an occupational cohort;Pearce, N.; Checkoway, H.; Shy, C.;Scand J Work Environ Health,1986
5. The 'healthy worker effect' on morbidity rates;Sterling, T.D.; Weinkam, J.J.;JOM,1985