1982 Volume 48 Issue 3 Pages 127-141
Standardized mortality ratios (SMRs) for 35 causes of death by industry in 1970 and 1975 in Japan are calculated. Eliminating the biases between the base industry population and the number of death by industry, furthermore, the ratio of the SMR for each cause of death to the SMR for all causes by industry is computed. This ratio is nominated as SMRR. SMRR by industry and cause of death is correlated each other according to industry side and also cause of death side. Based on the correlation coefficient matrix, assumed factors are deduced applying the centroid method of factor analysis. Factor one to factor three are determined.(1) SMR is higher than other industries in the "mining" and "electricity, gas, water and heat industries."(2) On the results of factor analysis, (a) malignant neoplasms, (b) pneumonia and bronchitis, (c) automobile and industrial accidents, and (d) drowning and fire accidents, i.e. four groups of cause of deaths are assessed. Profile values of these three factors for each industry are computed. Two distinct groups, open air work place industries and indoor work place industries are found. "Agriculture" and "manufacturing" industries show a similarity of weights of factors. From the factor analysis based on the correlation matrix of SMRR by industry, the same result is found as in- and out-door work place. "Agriculture" and "manufacturing"; "transport and communication" and "fishery and aquiculture" show a good similarity.
