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The Oq-45: The Structure Of Mental Health Symptoms During Psychotherapy, Lindsay Arader

Theses and Dissertations

The structure of the Outcome Questionnaire-45 (OQ-45; Lambert et al., 2004b) was examined across three time points in a sample of 199 psychotherapy clients at an outpatient community clinic in the greater New York area. Five models—a one-factor model, two-factor (oblique) model, three-factor (oblique) model, two sub-factor bifactor model, and three sub-factor bifactor model—were tested at baseline, 8 weeks, and 16 weeks. The two sub-factor bifactor model fit the data best at baseline, and the three sub-factor bifactor model fit the data best at 8 weeks and 16 weeks. These results demonstrate that the OQ-45 items load onto one general …