Background: Living alone and limited social interaction are associated with frailty, while low satisfaction with interactions is associated with negative health outcomes. However, the effects of living arrangements, interaction frequency, and interaction satisfaction on physical frailty remain unclear. This study examined the associations among living arrangements, the frequency and satisfaction of social interactions, and physical frailty among community-dwelling older adults. Methods: A cross-sectional study was conducted among 5,538 community-dwelling adults aged 60 or older living in Aichi Prefecture, Japan. The revised Japanese version of the Cardiovascular Health Study criteria evaluated physical frailty. Frequency and satisfaction of social interactions were evaluated using the National Center for Geriatrics and Gerontology–Social Network Scale (SNS). Logistic regression analysis was conducted by living arrangement, with physical frailty as the dependent variable and the SNS as the explanatory variable. In the sensitivity analysis, SNS was categorized into two groups based on the median, then combined with living arrangements into four groups to examine the association with physical frailty. Results: A total of 338 (6.3%) participants were classified as physically frail. Participants with high SNS scores showed significantly lower odds of physical frailty regardless of living arrangement (OR: 0.36, 95% confidence interval [CI]: 0.16-0.80; OR: 0.66, 95% CI: 0.45-0.96). Sensitivity analysis similarly showed the high SNS group had lower ORs for physical frailty, regardless of living arrangements. Conclusion High frequency and satisfaction with social interactions were negatively associated with physical frailty, suggesting that enhancing both aspects of social engagement may be beneficial.

Clinical training programs play an extremely important role in the new postgraduate clinical training system introduced in 2004 because facilities for clinical training now include various health-related institutions in addition to the university hospitals and special hospitals for clinical training used in the previous system. Although educational goals have been established by the Ministry of Health, Labour and Welfare, trainees may have difficulty achieving these goals, even under the guidance of staff at the various facilities. There are differences in the function and quality of health-related institutions in the community. For the practical and convenient application of educational goals, we have attempted develop a “model program” to supplement the objectives indicated by the learning goals with more specific objectives. These supplementary objectives can be modified by individual institutions. We hope that this “model program” contributes to the development of objectives for each institution and helps improve the quality of the postgraduate training system in Japan.