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Open Access Research article

French version validation of the psychotic symptom rating scales (PSYRATS) for outpatients with persistent psychotic symptoms

Jerome Favrod12*, Shyhrete Rexhaj12, Pascale Ferrari12, Sabrina Bardy2, Claude Hayoz3, Stéphane Morandi2, Charles Bonsack2 and Fabienne Giuliani2

Author Affiliations

1 La Source, Health Campus of the University of Applied Sciences of Western Switzerland, Lausanne, Switzerland

2 Department of Psychiatry, Community Psychiatry Service, University Hospital Center of Lausanne, Lausanne, Switzerland

3 Fondation HorizonSud, Marsens, Switzerland

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BMC Psychiatry 2012, 12:161  doi:10.1186/1471-244X-12-161

Published: 28 September 2012

Abstract

Background

Most scales that assess the presence and severity of psychotic symptoms often measure a broad range of experiences and behaviours, something that restricts the detailed measurement of specific symptoms such as delusions or hallucinations. The Psychotic Symptom Rating Scales (PSYRATS) is a clinical assessment tool that focuses on the detailed measurement of these core symptoms. The goal of this study was to examine the psychometric properties of the French version of the PSYRATS.

Methods

A sample of 103 outpatients suffering from schizophrenia or schizoaffective disorders and presenting persistent psychotic symptoms over the previous three months was assessed using the PSYRATS. Seventy-five sample participants were also assessed with the Positive And Negative Syndrome Scale (PANSS).

Results

ICCs were superior to .90 for all items of the PSYRATS. Factor analysis replicated the factorial structure of the original version of the delusions scale. Similar to previous replications, the factor structure of the hallucinations scale was partially replicated. Convergent validity indicated that some specific PSYRATS items do not correlate with the PANSS delusions or hallucinations. The distress items of the PSYRATS are negatively correlated with the grandiosity scale of the PANSS.

Conclusions

The results of this study are limited by the relatively small sample size as well as the selection of participants with persistent symptoms. The French version of the PSYRATS partially replicates previously published results. Differences in factor structure of the hallucinations scale might be explained by greater variability of its elements. The future development of the scale should take into account the presence of grandiosity in order to better capture details of the psychotic experience.

Keywords:
Hallucination; Delusion; Schizophrenia; PSYRATS; PANSS; Reliability; Validity