Relations among self-certainty, sense of control and quality of life

This article investigates the mediation effect of the sense of control on the relationship between self-certainty and quality of life (QOL). In the first study, 101 students at National Taiwan University (NTU) completed a self-certainty rating scale with respect to interpersonal traits of the general self and three role-specific selves (son/daughter, sibling, and friend). They also filled out the WHOQOL-BREF (World Health Organization Quality of Life questionnaire-brief version) Taiwan version to assess QOL. A two-factor confirmatory factor analysis revealed that self-certainty on interpersonal traits has a positive relationship with QOL. In the second study, 121 NTU students completed a self-certainty rating scale with respect to personality traits of the general self and two role-specific selves (son/daughter and friend), a control scale measuring sense of control, and the WHOQOL-BREF Taiwan version assessing QOL. A two-factor confirmatory factor analysis revealed that selfcertainty on personality traits has a positive relationship with QOL. In addition, a structural equation model revealed that the sense of self-control mediated the positive relation between self-certainty and QOL. The findings showed that people with higher self-certainty had a higher sense of control and, hence, led a better life. The results also showed that the positive relationship between self-certainty and QOL was stronger when self-certainty was assessed with interpersonal traits than with personality traits. Implications of this study for self research and adjustment are discussed.