Background/Objectives: In this study, the relation between family strength and social capital is understood to increase psychological well-being of adults and investigate the mediation effect of social capital in the relation between family strength and psychological well-being. Methods/Statistical Analysis: Survey analysis was performed on 152 adults in their 30s who live in Daejeon Metropolitan City to investigate the influence of family strength on psychological well-being of adults and the mediation effect of social capital in the relation of two variables. Findings: Multiple regression analysis was conducted to verify the influence of socio-demographic variables and family strength on psychological well-being. As a result of model 1 analysis, explanatory power was shown to be 20.0% and the regression model was shown to be significant. Among variables, academic abilities other than university graduation or higher showed to have significantly low psychological well-being. Model 2 which added family strength had explanatory power of 28% and the regression model was also significant. Multiple regression analysis was conducted to verify the influence of socio-demographic variables and family strength on social capital. First, by inserting socio-demographic variables in model 1, explanatory power was shown to be 24.0% and the regression model was shown to be significant. Model 2 which added family strength had explanatory power of 39% and the regression model was also significant. As a result of regression analysis, family strength showed to have significant influence on social capital and psychological well-being. It was shown that the influence of family strength in the third step with inserted mediating variable had significantly decreased compared to the first step on dependent (Sobel Z = 2.09, p<.05). Application/Improvements: In this study, the relation between the factors that influence mental welfare was analyzed through mediation effect to investigate specific influences of each variable in which there is meaning that basic data was provided for establishing practical plans to enhance psychological well-being.
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