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This study examined in the interpersonal context whether interactions of intolerance of ambiguity and positive as well as negative life events in a diathesis-stress model predicted changes in mental health. College students, 236 men and women, completed a questionnaire of Revised Interpersonal Intolerance of Ambiguity (IIAS-R), Stress Response, and Happiness scales. They completed one and a half months later another questionnaire of Interpersonal Life Event, Stress Response, and Happiness scales. Hierarchical regression analyses showed that for men interaction terms of IIAS-R's Friend scores with a negative life event score significantly predicted an increase in stress response. For women, interaction terms of IIAS-R's Stranger scores with a negative life event score significantly predicted a decrease in happiness. The results suggested that the diathesis-stress model was partially supported, and men and women were different in terms of the criterion mental-health variables that could be predicted by the interaction terms.

This study examined whether attitudes towards ambiguity and interpersonal stress events in a diathesis-stress model predicted changes in depression. Sixty-seven female college students were asked to answer the Attitudes Towards Ambiguity Scale (ATAS), and the Zung Self-Rating Depression Scale (SDS). After one month, they were asked to complete the Scale of Interpersonal Stressor (SIS), and SDS.We measured SDS twice in order to investigate residual change of depression. Hierarchical multiple regression analysis showed that the interaction term of negative attitudes toward ambiguity and interpersonal friction significantly predicted changes in depression. Simple slope analysis showed that participants who did not have negative attitudes toward ambiguity and experienced a higher degree of interpersonal friction showed significantly lower reductions in depression scores than those who experienced a lower degree of interpersonal friction. But the other interaction terms were not significant. These results suggest that the diathesis-stress model was not supported and that attitudes towards ambiguity were not sufficient to consider as a diathesis for depression.

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