Association of laughter and social communication with oral frailty among residents in Fukushima: a cross-sectional study

Oral frailty (OF) is a form of frailty. Laughter and social communication such as talking and participating in community activities, contribute to extending healthy life expectancy by reducing stress and increasing physical activity. However, limited research exists on the association between laughter and social communication and OF. This cross-sectional study aimed to explore the association of laughter and social communication with the risk of developing OF using the eight-item OF Index among Fukushima residents. In 2020-2021, 916 residents aged 60-79 were surveyed regarding OF and psychosocial factors. Binomial logistic regression analysis was performed to calculate odds ratios (ORs) and 95% confidence intervals (CIs) for psychosocial factors associated with the OF prevalence. The OF prevalence was 41.5%. The sex- and age-adjusted ORs (95% CIs) for psychosocial factors associated with OF prevalence were 0.38 (0.26-0.57) for daily laughter, 0.51 (0.35-0.76) for laughter 1-5 times/week, 0.42 (0.20-0.89) for daily talking, 0.40 (0.22-0.72) for participating in community activities more than once/week, and 0.29 (0.20-0.43) for no depressive symptoms. After multivariate adjustment, only daily laughter and no depressive symptoms were associated with OF. As a public health strategy, increasing laughter and social communication frequencies, along with reducing depressive symptoms, may enhance healthy life expectancy through improved frailty.