BACKGROUND: Previous literature has shown that personality is one of the most important predictors of Subjective Wellbeing. However, the mechanisms through which basic personality dispositions contribute to wellbeing have scarcely been explored. Therefore, in this study we examined the mediating role of Optimism in the relationship between the Big Five personality model (both factors and facets) and Subjective Wellbeing. Additionally, we assessed whether the results varied by sex. METHOD: A sample of 611 Spanish adolescents completed self-report measures of BFQ, LOT-R, and SHS. We conducted structural equation modeling to test the proposed mediating models. RESULTS: Optimism completely mediated the relationship between Extraversion and Emotional Stability factors and Subjective Wellbeing. Likewise, Optimism mediated the relationship between the personality facets Politeness, Perseverance, Emotion control, Impulse control, and Dynamism and Subjective Wellbeing. The findings were invariant by sex. CONCLUSIONS: These results provide help in identifying the possible mechanisms through which basic dispositions of personality contribute to wellbeing. These findings can be used to develop interventions that target the promotion of greater Subjective Wellbeing through Optimism, and thereby improve adolescents' adjustment.
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