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Is the PANSS used correctly? a systematic review.
Michael Obermeier1, Rebecca Schennach-Wolff, Sebastian Meyer
1Department of Psychiatry and Psychotherapy, Ludwig-Maximilians-University Munich, Nussbaumstrasse 7, Munich, Germany. Michael.Obermeier@med.uni-muenchen.de.
BMC Psychiatry
|July 20, 2011
Summary
Incorrect calculations of the Positive and Negative Syndrome Scale (PANSS) are common in schizophrenia research. Standardizing these calculations is crucial for accurate treatment efficacy assessment.
Area of Science:
- Psychiatry
- Psychometrics
- Clinical Research
Background:
- The Positive and Negative Syndrome Scale (PANSS) is a key instrument for schizophrenia assessment.
- Debate exists regarding the mathematical properties of the PANSS, specifically its scale level (interval vs. ratio).
- Incorrectly treating the PANSS as a ratio scale can lead to erroneous conclusions about treatment efficacy.
Purpose of the Study:
- To investigate the methods used for calculating percent changes in PANSS scores in psychiatric literature.
- To identify the prevalence of incorrect mathematical approaches in PANSS data analysis.
Main Methods:
- A systematic literature search was conducted on PubMed, adhering to PRISMA guidelines.
- Articles from top-ranked psychiatric journals using "PANSS" and "response" were analyzed for percent change calculation methods.
Main Results:
- A significant majority of studies (62%) appear to use incorrect methods for calculating percent changes in PANSS scores.
- The specific methods for calculation were often not detailed in the manuscripts.
Conclusions:
- The findings highlight a critical issue in schizophrenia research methodology.
- There is an urgent need for standardized calculation procedures for the PANSS to ensure reliable and valid results.
