Scalability of the Positive and Negative Syndrome Scale in first-episode schizophrenia assessed by Rasch models.

ABSTRACT:

Objective

Historically, assessment of the psychometric properties of the Positive and Negative Syndrome Scale (PANSS) has had several foci: (1) calculation of reliability indexes, (2) extraction of subdimensions from the scale, and (3) assessment of the validity of the total score. In this study, we aimed to examine the scalability and to assess the clinical performance of the 30-item PANSS total score as well as the scalability of a shorter version (PANSS-6) of the scale.

Methods

A composite data set of 1073 patients with first-episode schizophrenia or schizophrenia spectrum disorder was subjected to Rasch analysis of PANSS data from baseline and 4-6 weeks follow-up.

Results

The central tests of fit of the Rasch model failed to satisfy the statistical requirements be

SUBMITTER: Baandrup L 

PROVIDER: S-EPMC9325503 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature