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The Association between Oxytocin and Social Capital
Authors:Takeo Fujiwara  Laura D Kubzansky  Kenji Matsumoto  Ichiro Kawachi
Institution:1. Department of Social Medicine, National Research Institute for Child Health and Development, Tokyo, Japan.; 2. Department of Society, Human Development, and Health, Harvard School of Public Health, Massachusetts, United States of America.; 3. Department of Allergy and Immunology, National Research Institute for Child Health and Development, Tokyo, Japan.; Umeå University, Sweden,
Abstract:

Background

Oxytocin is known to be related to social behaviors, including trust. However, few studies have investigated the association between oxytocin levels and social capital. Thus, we tested the hypothesis that endogenous oxytocin levels are positively associated with social capital. We also considered whether the association differed across gender because previous studies have shown differential effects of OT on social behaviors depending on gender.

Methods

We recruited a convenience sample of 50 women and 31 men in Japan via community sampling from whom we obtained urine sample with which to measure oxytocin levels. Individual-level cognitive social capital (social trust and mutual aid) and structural social capital (community participation) were assessed using a questionnaire. We used multivariate regression, adjusted for covariates (age, number of children, self-rated health, and education), and stratified by gender to consider associations between oxytocin and social capital.

Results

Among women, oxytocin was inversely associated with social trust and mutual aid (p<0.05). However, women participating in only 1 organization in the community showed higher oxytocin than women who participated in either no organizations (p<0.05) or 2 or more organization (i.e. inverse-U shape association). Among men, no association was observed between oxytocin and either form of cognitive and structural social capital.

Conclusion

Women who perceived low cognitive social capital showed higher oxytocin levels, while structural social capital showed inverse-U shape association with oxytocin. No association between oxytocin and social capital was found among men. Further study is needed to elucidate why oxytocin was inversely associated with cognitive social capital only among women.
Keywords:
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