Background: Statistical models based on item response theory were used to examine (a) the performance of individual Positive and Negative Syndrome Scale (PANSS) items and their options, (b) the ...
Data included baseline PANSS item scores from 9,205 patients with schizophrenia, schizoaffective, or schizophreniform disorders who were enrolled between 1995 and 2003 in either a large, naturalistic, ...
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