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Anxiety sensitivity (i.e., fear of arousal-related bodily sensations, including sensations that arise from normal physiological processes, due to the personal belief that these sensations will produce harmful consequences) is an important psychological construct involved in the etiology and maintenance of different anxiety disorders. The present study evaluated the psychometric proprieties and the factor structure of the 18-item Anxiety Sensitivity Index-3 (ASI-3) among 585 Brazilian patients with primary anxiety disorder diagnosis. Results indicated good internal consistency and item-total correlation coefficients. Exploratory factor analyses suggested a hierarchical structure composed of a single higher-order factor and three lower-order factors related to physical, cognitive and social concern. ASI-3 score comparisons across the different anxiety disorder groups indicated that panic disorder patients produced significantly higher overall ASI-3 scores as well as on the physical and social subscales. [ABSTRACT FROM AUTHOR]