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Using confirmatory factor analysis, we tested the 3\u2010factor <jats:italic>DSM\u2010IV<\/jats:italic> PTSD model, 2 separate 4\u2010factor models (Dysphoria vs. Emotional Numbing) and a recently conceptualized 5\u2010factor Dysphoric Arousal model. We found a slight, but significant advantage for the Dysphoria model over the Emotional Numbing model on the PTSD\u2010RI, with a difference in Bayesian information criterion (BIC) values of 81 points. As with several recent studies of adult trauma victims, we found a slight advantage for the Dysphoric Arousal model over the other models on the PTSD\u2010RI, with BIC differences exceeding 300 points. Retaining the Dysphoric Arousal model, we tested the convergent validity of the PTSD\u2010RI factors against subscales of the Trauma Symptom Checklist for Children. Supporting the convergent validity of the PTSD\u2010RI, in the Dysphoric Arousal model, the dysphoric arousal factor related most strongly to anger, whereas the emotional numbing factor related most strongly to depression, and anxious arousal factor related most strongly to anxiety. Results support the use of the PTSD\u2010RI for evaluating PTSD among youth.<\/jats:p>","DOI":"10.1002\/jts.21755","type":"journal-article","created":{"date-parts":[[2013,2,18]],"date-time":"2013-02-18T14:48:39Z","timestamp":1361198919000},"page":"10-18","source":"Crossref","is-referenced-by-count":114,"title":["Psychometric Properties of the UCLA PTSD Reaction Index. 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