Empirical assessment of the factorial structure of clinical symptoms in schizophrenia: negative symptoms.
The factor structure of the Scale for the Assessment of Negative Symptoms (SANS) was examined in a confirmatory factor analysis that used the LISREL procedure. Four models of negative symptom factors were tested in 130 hospitalized schizophrenic patients. A three-factor model of diminished expression, social dysfunction, and disorganization generated by the authors yielded a superior fit to the data relative to the two-factor model of Liddle (1987b) and a unifactorial severity model. A four-factor model based on the original subscale formulation of the SANS failed to fit the data.
Keefe, RS; Harvey, PD; Lenzenweger, MF; Davidson, M; Apter, SH; Schmeidler, J; Mohs, RC; Davis, KL
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