For the purpose of investigating the factor relating to the recent average life span (e
0) in Japan, relationships between e
0 and 22 indices concerning dwelling, economy, education and health preceding e
0 for 5 years were studied by annual changes and geographical differences, and the following results were obtained. 1) In the time serial correlation coefficients between e
0 and indices, those with waterworks extension rate (W-rate) and the number of cases visited by public health nurses in charge of consultation about adult disease (C-number) were positive and significant, and those with livelihood protection rate (L-rate) were negative and significant. 2) In the geographical correlation coefficients between e
0 and indices, and those or partial correlation coefficients between annual changes of e
0 and indices, only those with W-rate and L-rate were significant in common with 3 methods of calculations for men, so were C-number for women. 3) In the multiple regression analyses of the annual changes of e
0 on indices by forward selection procedure, W-rate was selected as the first variable for men and Cnumber for women, and L-rate as the second for both sexes. Above results suggest that W-rate and L-rate relate to e
0 for men and C-number and L-rate for women.
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