Comparing mortality in an occupational cohort with incidence rates of the general population--the bias introduced through the use of five-year age intervals.
The use of five-year age intervals will introduce a bias when mortality or morbidity rates for a cohort are compared with incidence rates from the general population. In a cohort of Swedish machining workers, the expected mortality and morbidity rates from cancer were reduced by about 5 per cent when one-year age intervals were used instead of five-year age intervals.
D000328:Adult; D000367:Age Factors; D000368:Aged; D004812:Epidemiologic Methods; D006801:Humans; D008297:Male; D008669:Metallurgy; D008875:Middle Aged; D009017:Morbidity; D009026:Mortality; D009369:Neoplasms / Q000401:mortality; D009784:Occupational Diseases / Q000401:mortality*; D013548:Sweden