Laura B Bragdon1, Gretchen J Diefenbach2, Scott Hannan3, David F Tolin2. 1. Binghamton Anxiety Clinic, Department of Psychology, Binghamton University, United States. Electronic address: lbragdo1@binghamton.edu. 2. Anxiety Disorders Center, The Institute of Living, Hartford Hospital, United States; Yale University School of Medicine, United States. 3. Anxiety Disorders Center, The Institute of Living, Hartford Hospital, United States.
Abstract
BACKGROUND: The Overall Anxiety Severity and Impairment Scale (OASIS) is a brief, transdiagnostic measure used to assess anxiety severity and related interference. The OASIS has demonstrated strong psychometric properties in previous investigations, however, it has yet to be validated using a transdiagnostic clinician-rated measure. METHODS: We evaluated the factor structure, convergent and discriminant validity, and illness severity cut-scores of the OASIS in a sample of outpatients (N=202). RESULTS: A confirmatory factor analysis indicated an unidimensional structure provided the best fit. The OASIS demonstrated good convergent validity and internal consistency. Using the Clinical Global Impression-Severity Scale (CGI-S), ROC curves showed OASIS scores of 6, 10 and 12 to indicate moderate, marked and severe illness severity, respectively. CONCLUSIONS: The OASIS is a unidimensional self-report measure with good convergent validity and data from the current study provide illness severity cut-scores.
BACKGROUND: The Overall Anxiety Severity and Impairment Scale (OASIS) is a brief, transdiagnostic measure used to assess anxiety severity and related interference. The OASIS has demonstrated strong psychometric properties in previous investigations, however, it has yet to be validated using a transdiagnostic clinician-rated measure. METHODS: We evaluated the factor structure, convergent and discriminant validity, and illness severity cut-scores of the OASIS in a sample of outpatients (N=202). RESULTS: A confirmatory factor analysis indicated an unidimensional structure provided the best fit. The OASIS demonstrated good convergent validity and internal consistency. Using the Clinical Global Impression-Severity Scale (CGI-S), ROC curves showed OASIS scores of 6, 10 and 12 to indicate moderate, marked and severe illness severity, respectively. CONCLUSIONS: The OASIS is a unidimensional self-report measure with good convergent validity and data from the current study provide illness severity cut-scores.
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