Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/66235
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Type: Journal article
Title: Comparisons of methamphetamine psychotic and schizophrenic symptoms: A differential item functioning analysis
Author: Srisurapanont, M.
Arunpongpaisal, S.
Wada, K.
Marsden, J.
Ali, R.
Kongsakon, R.
Citation: Progress in Neuro-psychopharmacology & Biological Psychiatry, 2011; 35(4):959-964
Publisher: Pergamon-Elsevier Science Ltd
Issue Date: 2011
ISSN: 0278-5846
1878-4216
Statement of
Responsibility: 
Manit Srisurapanont, Suwanna Arunpongpaisal, Kiyoshi Wada, John Marsden, Robert Ali, Ronnachai Kongsakon
Abstract: The concept of negative symptoms in methamphetamine (MA) psychosis (e.g., poverty of speech, flatten affect, and loss of drive) is still uncertain. This study aimed to use differential item functioning (DIF) statistical techniques to differentiate the severity of psychotic symptoms between MA psychotic and schizophrenic patients. Data of MA psychotic and schizophrenic patients were those of the participants in the WHO Multi-Site Project on Methamphetamine-Induced Psychosis (or WHO-MAIP study) and the Risperidone Long-Acting Injection in Thai Schizophrenic Patients (or RLAI-Thai study), respectively. To confirm the unidimensionality of psychotic syndromes, we applied the exploratory and confirmatory factor analyses (EFA and CFA) on the eight items of Manchester scale. We conducted the DIF analysis of psychotic symptoms observed in both groups by using nonparametric kernel-smoothing techniques of item response theory. A DIF composite index of 0.30 or greater indicated the difference of symptom severity. The analyses included the data of 168 MA psychotic participants and the baseline data of 169 schizophrenic patients. For both data sets, the EFA and CFA suggested a three-factor model of the psychotic symptoms, including negative syndrome (poverty of speech, psychomotor retardation and flatten/incongruous affect), positive syndrome (delusions, hallucinations and incoherent speech) and anxiety/depression syndrome (anxiety and depression). The DIF composite indexes comparing the severity differences of all eight psychotic symptoms were lower than 0.3. The results suggest that, at the same level of syndrome severity (i.e., negative, positive, and anxiety/depression syndromes), the severity of psychotic symptoms, including the negative ones, observed in MA psychotic and schizophrenic patients are almost the same.
Keywords: Differential item functioning; Methamphetamine; Psychosis; Schizophrenia; Symptom
Rights: © 2011 Elsevier Inc. All rights reserved.
RMID: 0020110263
DOI: 10.1016/j.pnpbp.2011.01.014
Appears in Collections:Pharmacology publications

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