[Statistical and preventive studies of the diseases among the aged --rural and urban population].
D000368:Aged; D006262:Health / Q000639:trends*; D006801:Humans; D007564:Japan; D008875:Middle Aged; D009026:Mortality; D011314:Preventive Health Services; D012423:Rural Health / Q000639:trends*; D014504:Urban Health / Q000639:trends*