PANSS: how many patients should we include for research Review article
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Abstract
Positive and Negative Syndrome Scale (PANSS) is one of the basic research tools in schizophrenia and other mental disorders. The impact of group size on the results of factor analyzes in paranoid schizophrenia, and thus on the reliability and validity of the test results, was analyzed. To do this, the group of 400 patients was examined, including to factor analysis gradually decreasing number of 400, 350, 300, 250, 200, 150, 100, 75 and 50 patients. Factor analysis of 100 or smaller groups turned out to be unstable, while satisfactory stabilization of results was obtained when analyzing 150 or more patients.
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