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The COVID-19 pandemic has been a time of great uncertainty for the general population and highlights the need to understand how attitudes towards uncertainty may affect well-being. Intolerance of uncertainty is a trait associated with worry, anxiety, and mood disorders. As adaptive emotion regulation supports well-being and mental health, it is possible that intolerance of uncertainty is also associated with the ability and tendency to regulate emotions. However, the relationships between intolerance of uncertainty and widely studied cognitive emotion regulation strategies - such as reappraisal and suppression - have received little attention. In two studies that recruited participants online from the United States, we tested the hypotheses that higher trait intolerance of uncertainty would be associated with greater worry, decreased capacity and tendency to use reappraisal, and increased tendency to use suppression in daily life. Study 1 provided an initial test of our hypotheses. Study 2 was a confirmatory, preregistered study that replicated findings in a young adult sample, demonstrating that scores on the Intolerance of Uncertainty Scale (IUS) were associated with greater COVID-related worry, decreased capacity to regulate negative emotions on a task that manipulated the use of reappraisal, and greater self-reported use of suppression in daily life. Together, these results indicate that intolerance of uncertainty is associated with the capacity and tendency to use emotion regulation strategies important for well-being.

Trait Intolerance of Uncertainty Is Associated with Decreased Reappraisal Capacity and Increased Suppression Tendency