Trait mindfulness as a buffer against intolerance of uncertainty and its effects on psychological well-being

Objectives: Based on the transactional model of stress and coping, this study conducted a study aimed at investigating the relationships among trait mindfulness, intolerance of uncertainty, and psychological well-being. Methods: A total of 307 South Korean adults (50.2% male; M _age = 44.27 years [ SD = 8.46]) completed validated self-report questionnaires measuring the proposed variables. Results: Structural equation modeling analysis showed an acceptable fit and supported the proposed relationships. More specifically, high trait mindfulness was significantly related to low intolerance of uncertainty (β = -. 34, p <. 001), and intolerance of uncertainty and psychological well-being were significantly negatively correlated (β = −. 37, p <. 001). Moreover, mediation analysis revealed that intolerance of uncertainty significantly mediated the association between trait mindfulness and psychological well-being (β =. 12, p = .001). Conclusions: The findings show that highly mindful individuals demonstrate less cognitive and emotional reactivity toward uncertainty than individuals lower in trait mindfulness, which in turn leads to higher levels of psychological well-being. These results have important theoretical implications for understanding the psychological processes involved in trait mindfulness and suggest that mindfulness-based strategies specifically aimed at reducing intolerance of uncertainty may be effective in increasing psychological well-being.