Longitudinal construct validity of Brief Symptom Inventory subscales in schizophrenia |
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Authors: | Long Jeffrey D Harring Jeffrey R Brekke John S Test Mary Ann Greenberg Jan |
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Institution: | Department of Educational Psychology, Quantitative Methods in Education, University of Minnesota-Twin Cities, 178 Pillsbury Drive SE, Minneapolis, MN 55455, USA. longj@umn.edu |
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Abstract: | Longitudinal validity of Brief Symptom Inventory subscales was examined in a sample (N = 318) with schizophrenia-related illness measured at baseline and every 6 months for 3 years. Nonlinear factor analysis of items was used to test graded response models (GRMs) for subscales in isolation. The models varied in their within-time and between-times parameter constraints, with the homogeneous model being the least constrained, followed by the 2-parameter GRM and 1-parameter GRM. Results show that 4 subscales (Interpersonal Sensitivity, Hostility, Paranoid Ideation, Psychoticism) were consistent with the 1-parameter GRM, and 5 subscales (Somatization, Obsessive-Compulsive, Depression, Anxiety, Phobic Anxiety) were consistent with the 2-parameter GRM. There is evidence that the 9 subscales may be validly used to study change in single constructs over time. |
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