Negative Symptom Inventory-Self-Report (NSI-SR): Initial development and validation.

Autor: Raugh IM; Department of Psychology, University of Georgia, Athens, GA, USA., Luther L; Department of Psychology, University of Georgia, Athens, GA, USA., Bartolomeo LA; Department of Psychology, University of Georgia, Athens, GA, USA., Gupta T; Department of Psychology, Northwestern University, Evanston, IL, USA., Ristanovic I; Department of Psychology, Northwestern University, Evanston, IL, USA., Pelletier-Baldelli A; Department of Psychology and Neuroscience, University of North Carolina, Chapel Hill, NC, USA., Mittal VA; Department of Psychology, Northwestern University, Evanston, IL, USA., Walker EF; Department of Psychology, Emory University, Atlanta, GA, USA., Strauss GP; Department of Psychology, University of Georgia, Athens, GA, USA. Electronic address: gstrauss@uga.edu.
Jazyk: angličtina
Zdroj: Schizophrenia research [Schizophr Res] 2023 Jun; Vol. 256, pp. 79-87. Date of Electronic Publication: 2023 May 10.
DOI: 10.1016/j.schres.2023.04.015
Abstrakt: Negative symptoms (i.e., anhedonia, avolition, asociality, blunted affect, alogia) are frequently observed in the schizophrenia-spectrum (SZ) and associated with functional disability. While semi-structured interviews of negative symptoms represent a gold-standard approach, they require specialized training and may be vulnerable to rater biases. Thus, brief self-report questionnaires measuring negative symptoms may be useful. Existing negative symptom questionnaires demonstrate that this approach may be promising in schizophrenia, but no measure has been devised for use across stages of psychotic illness. The present study reports initial psychometric validation of the Negative Symptom Inventory-Self-Report (NSI-SR), the self-report counterpart of the Negative Symptom Inventory-Psychosis Risk clinical interview. The NSI-SR is a novel transphasic negative symptoms measure assessing the domains of anhedonia, avolition, and asociality. The NSI-SR and related measures were administered to two samples: 1) undergraduates (n = 335), 2) community participants, including: SZ (n = 32), clinical-high risk for psychosis (CHR, n = 25), and healthy controls matched to SZ (n = 31) and CHR (n = 30). The psychometrically trimmed 11-item NSI-SR showed good internal consistency and a three-factor solution reflecting avolition, asociality, and anhedonia. The NSI-SR demonstrated convergent validity via moderate to large correlations with clinician-rated negative symptoms and related constructs in both samples. Discriminant validity was supported by lower correlations with positive symptoms in both samples; however, correlations with positive symptoms were still significant. These initial psychometric findings suggest that the NSI-SR is a reliable and valid brief questionnaire capable of measuring negative symptoms across phases of psychotic illness.
Competing Interests: Declaration of competing interest G.P.S. is one of the original developers of the Brief Negative Symptom Scale (BNSS) and receives royalties and consultation fees from ProPhase LLC in connection with commercial use of the BNSS and other professional activities.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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