Quantification of differences between proportionate mortality ratios and standardized mortality ratios.
Waxweiler-RJ; Haring-MK; Leffingwell-SS; Halperin-WH
Quantification of Occupational Cancer, Banbury Report No. 9, Peto 1981; :379-386
Differences between proportionate mortality ratios (PMR) and standardized mortality ratios (SMR) were quantified. A cohort of white males employed between 1950 and 1977 at a large factory was followed through 1977 using routine follow up sources. Observed and expected deaths and SMR based on US expected rates for white males, adjusted by age and calendar period, were calculated separately for person years at risk both below and above 15 years of employment. Among persons dying before 15 years of employment, the company knew of about 35 percent of the deaths through the employee benefits program. Among persons dying after 15 years of employment, the company knew of 90 percent. For workers with less than 15 years of employment, substantial differences occurred for all malignant neoplasms, pancreatic malignant neoplasms, and non malignant respiratory disease; minor differences occurred in the greater than 15 years of employment group. The company was aware of a higher percentage of deaths due to malignant neoplasms than of deaths due to stroke or non malignant respiratory disease. The cause specific PMR was about 40 percent greater than the corresponding SMR, as was true for the relative SMR. The authors conclude that PMR studies based on deaths ascertained through an employee benefits program among long term employees are closer to the relative SMR than the SMR. The PMR may be a better parameter for occupational mortality surveillance than the SMR.
Epidemiology; Cancer-rate; Mortality-rates; Occupational-diseases; Cardiovascular-disease; Occupational-exposure; Malignant-neoplasms; Pulmonary-system-disorders; Accident-statistics; Mortality-surveys;
Asthma and Chronic Obstructive Pulmonary Disease; Disease and Injury; Pulmonary-system-disorders;
Quantification of Occupational Cancer, Banbury Report No. 9, Peto