The purpose of this study was to identify the effect of extraversion, social network size, and social interaction on loneliness among the elderly. To examine our hypothesis, we used data from the “Korean Social Life, Health, and Aging Project; KSHAP”study, which included authors of this study. A total of 122 older adults completed the Big Five Inventory, the UCLA Loneliness Scale, and the General Social Survey. These data were analyzed through structural equation modeling. The results were as follow. First, loneliness was negatively correlated with social interaction, and extraversion, while the social network size was not significant. Second, the relationship between loneliness and the social network size was significantly mediated by social interaction after adjusting for extraversion. The results of this study indicate that social interaction which reflects frequent meetings and communication is crucial in predicting loneliness among the elderly. It is also meaningful in understanding the path of loneliness.
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