The purpose of this study is to investigate the mediating effects of loneliness in the relationship between personality and depression. According to previous studies, personality factors, especially neuroticism and extraversion are related to depression and loneliness. In this study, personality factors related with elderly were expected to influence the level of depression. Moreover, it was expected that loneliness would have a mediation effect on this relationship. We used data from the study called “Korean Social Life, Health and Aging Project: KSHAP”, which included authors of this study. The results indicated that the personality factors of the elderly did not have a direct effect on depression. However, loneliness mediated the relationship between the personality factors like neuroticism, extraversion and depression and this partly approves the previous studies. The fact that personality factors did not directly affect depression, was an unexpected result compared to previous studies. This shows that people who have different personality traits might feel lonely differently and this relationship varies depending on the development of depression. Therefore, a psychosocial program that can reduce the loneliness in elderly people should be developed to ensure successful aging. It is suggested that personality traits of the elderly should be considered when developing such programs.
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