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Risk and cause
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age groups analysis appropriate associated asthma Attributable risk Australian petroleum industry benzene Biological calculated carried case-control study Chapter chemical cohort study compared comparison concerned confounding variables consider coronary heart disease cumulative incidence defined population definition denominator dose-response relationship employed employees epidemiological study example expected experience factor Glossary to terms healthy worker effect incidence density incidence rate individuals infectious mononucleosis investigation length of employment leukaemia lung cancer deaths matched measure Medical mesothelioma mortality national population neurotoxin non-smokers number of deaths observation period occupational epidemiology occupational health occurrence relationship odds ratio particular period of observation person person-years at risk population at risk problem question questionnaire reasons reference population relative risk repetition strain injury reported research idea respiratory sample sick worker situation smoking habits specified study base study population study subjects survey survivor bias union usually ventilatory function Wittenoom Wittenoom Gorge workforce