Married Annual Income Threshold for Survival Days among Both Elderly Suburban and Rural Dwellers

Objective: The purpose of this study was to make clear the relationship the survival days and the threshold of yearly marital income for both the suburban and rural elderly dwellers. Method: A total number of 13,195(response rate of 80.2%) living the suburban city of Tokyo. On the ei ther hand a total number of 5,320(response rate of 89.2%) living the rural town located in the middle of Kyusyu Island. Data were collected through self-administered questionnaires, with informed consent including marital yearly income. All of participants were followed and checked their survival status for 2,160 days. Data were analyzed by using SPSS28.0J for Windows. Results: In results of this analyses, survival days are significantly correlated with yearly marital income for both fields and sexes. 2.5 million yen for both sexes may be pointed out as a threshold marital yearly income for the rural elderly dwellers. On the other hand, 4.5 million yen may be pointed out as a threshold marital yearly income for the suburban elderly dwellers for both sexes. Elderly living in the rural area had a lower annual family income of about 0.83 to 1.5 million yen lower than those in the suburbs, but the length of survival day was almost similar. Conclusion: In results of this analyses, survival days are significantly correlated with yearly marital income for both fields and sexes. Future research is needed to make clear the relationships between equivalent income and survival days for both another areas and generations and also make clear the causal structure relationship.