Post, W.K.

worker exposure symptom absence study cnsld sickness absence subject disease sickness animal result probability complaint laboratory health fev 1 smoking asthma survey population animal feed industry prevalence group function peak flow measurements analysis questionnaire people effect surveillance number sensitivity lung function period table specificity decline incidence information duration musculoskeletal factor testing office clerks grain musculoskeletal complaints analyses ratio cnsld incidence industry value health care relationship mortality cohort relation office diagnosis absence rate screening laboratory animals allergy category measurement disorder bronchitis difference laboratory animal workers cause outcome chapter worker effect smoking habits spirometry percentile history clerk atopic extremity