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Lener MS, Goodnow SJ, Wood JA, et al. RGS4 and COMT risk variants are associated with brain structural alterations. Schizophr Res. 2013;150(1):321-2. doi:10.1016/j.schres.2013.07.013.
Khan A, Lindenmayer J-P, Opler M, Yavorsky C, Rothman B, Lucic L. A new Integrated Negative Symptom structure of the Positive and Negative Syndrome Scale (PANSS) in schizophrenia using item response analysis. Schizophr Res. 2013;150(1):185-96. doi:10.1016/j.schres.2013.07.007.
BACKGROUND: Debate persists with regard to how best to categorize the syndromal dimension of negative symptoms in schizophrenia. The aim was to first review published Principle Components Analysis (PCA) of the PANSS, and extract items most frequently included in the negative domain, and secondly, to examine the quality of items using Item Response Theory (IRT) to select items that best represent a measurable dimension (or dimensions) of negative symptoms. METHODS: First, 22 factor analyses and PCA met...
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