According to high mortality and specific risk factors following main diseases have been chosen for principal-factor solution in Japan, and England and Wales; cerebrovascular disease, ischemic hear disease, stomach cancer, cancers of trachea, bronchus and lung, accidents, poisonings and violence, and suicide. The factor analysis has been carried out using SMRs by occupation. The results are as follows; 1) In Japan first factors weighed are 0.97 for stomach cancer, 0.95 for cerebrovascular disease, 0.82 for accidents, poisonings and violence, and suicide, 0.75 for ischemic heart disease, and 0.57 for cancers of trachea, bronchus and lung. Among second factors weighed in Japan, -0.70 for suicide, and 0.69 for cancers of trachea, bronchus and lung are dominant. 67.9% of communality is attributed to the first factors, and 18.0% to the second factors. 2) In England and Wales, first factors weighed are 0.96 for stomach cancer, 0.94 for cerebrovascular disease, 0.88 for cancers of trachea, bronchus and lung, 0.87 for accidents, poisonings and violence, 0.76 for ischemic heart disease, and 0.19 for suicide. Among second factors weighed in England and Wales, 0.93 for suicide is dominant. 70.1% of communality is attributed to the first factors, and 18.4% to the second factors. 3) The disease having the bigger correlation coefficient between SMRs and stillbirth fates by occupation shows the bigger first factor weighed in both countries.
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