This study clarified a relationship between social interaction by using "Index of Social Interaction" and mortality after five years. The subjects were all 60 years of age and older who lived in a farming community near major urban centers in Japan (n=918). 153 subjects were deceased within five years period after survey. The contents of the questionnaire were "Index of Social Interaction (i.e. : Independence, Social curiosity, Interaction, Feeling of safety, Participation in the society), Activities of daily living, Age, Sex, Education, and Disease history. The results were as follows; 1) Young age, independence of mobility or daily living were significantly related to the low mortality after five years. 2) Among less than 75 years of age, "Reading books", "Having active role", and "Feeling being important" for male, and "Life style motivation", "Active approach", and "Feeling being important" for female were significantly related to lower mortality. 3) Among 75 years of age and older, "Reading books" for male, and "Reading newspapers", "Having active role", "Participation in neighborhood affairs", "Life style motivation", and "Active approach" for female were significantly related to lower mortality. 4) By logistic regression analysis adjusted for age, sex, length of education, mobility, activities of daily living, and disease revealed that odds of mortality was significantly high at low score of "Independence" for all adjusted models. "Social Curiosity", "Social Interaction" and "Participation in the Society" were significantly related to low mortality for some adjusted models. These suggested that active social interaction effected reduced mortality. Further research is needed on this cohort to develop a more effective scale of social interaction which can predict precisely the mortality related to socio-psychological factors.
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