Distress Intolerance (DI), defined as the perceived inability to tolerate negative mood states and experiential discomfort, has been posited as a vulnerability factor for several anxiety and emotional disorders. There is a relative paucity of research on DI in youth samples, in large part due to the absence of a psychometrically sound measure of DI in youth. The current study evaluated the psychometric properties of the Distress Intolerance Index for Youth (DII-Y) and the Distress Intolerance Index for Youth-Parent Report (DII-Y-P), which are downward extension adaptations of the adult-oriented Distress Intolerance Index (McHugh & Otto, 2012). Participants were 176 youth (ages 9-17) and their parents who were seeking treatment for child anxiety problems. The DII-Y and DII-Y-P demonstrated good-to-excellent internal consistency. Convergent validity of the DII-Y and the DII-Y-P was supported by large, significant associations with measures of intolerance of uncertainty, as well as with anxiety sensitivity in the case of the DII-Y. Discriminant validity of the DII-Y and the DII-Y-P was supported by the absence of significant direct relationships with a measure of defiant behavior. Results support the use of DII-Y and DII-Y-P as reliable and valid instruments for the assessment of youth DI, providing a practical and efficient tool to study DI as a potential factor in the etiology and maintenance of youth anxiety and emotional disorders.
Keywords: Anxiety; Assessment; Child; DII-Y; Distress Intolerance; Scale development.