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An evaluation of the Brief Symptom Inventory-18 using item response theory: which items are most strongly related to psychological distress?


, : An evaluation of the Brief Symptom Inventory-18 using item response theory: which items are most strongly related to psychological distress?. Psychological Assessment 23(1): 193-202

The psychometric structure of the Brief Symptom Inventory-18 (BSI-18; Derogatis, 2001) was investigated using Mokken scaling and parametric item response theory. Data of 487 outpatients, 266 students, and 207 prisoners were analyzed. Results of the Mokken analysis indicated that the BSI-18 formed a strong Mokken scale for outpatients and prisoners, indicating strong unidimensionality. For students, only the depression and anxiety items formed a medium Mokken scale. Parametric item response theory analyses showed that the best discriminating items came from the depression and anxiety subscales.

US$19.90

PMID: 21280957

DOI: 10.1037/a0021292


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