Abstract
The Social Suspiciousness Scale (SSS) is a 24-item self-report questionnaire designed to assess suspiciousness, along with the associated constructs of anger and hostility, within a social context. The present research evaluated the psychometric properties of this newly developed scale. The sample consisted of outpatients with social anxiety disorder (SAD; n = 145), unselected undergraduate university students (n = 162), and healthy community controls (n = 46). A principal components analysis suggested a one-factor solution. Internal consistency of the scale was high, and interitem correlations indicated that items were nonredundant. Test-retest reliability was strong. SSS scores were moderately correlated with measures of social anxiety, paranoia, anger and hostility. Moreover, in the outpatient SAD sample, SSS scores decreased significantly following a 12-week cognitive-behavioral group treatment program for SAD. The SSS may be a useful tool for measuring suspiciousness, anger and hostility across a variety of social contexts, particularly in individuals with SAD. This research contributes more generally to a broader understanding of SAD, and supports the importance of considering the role of mistrust and suspiciousness in this disorder.
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