Validation of the dimensions of psychosis instrument in Mexican patients with schizophrenia spectrum disorders

The objective was to determine the psychometric properties of the Dimensions of Psychosis Instrument (DIPI) in Mexican patients with schizophrenia spectrum disorders. One-hundred patients were recruited. Convergent and divergent validity were determined with the positive and negative scores of the Positive and Negative Syndrome Scale; a forced five-factor exploratory principal-components analysis with varimax rotation was developed. Total DIPI score shows an adequate convergent validity. The rotated principal component matrix accounted for 82.1% of the variance. Our study gives further support of the adequacy of the DIPI for the assessment of the five most common subjective experiences related to psychosis.