Versão reduzida da escala portuguesa Positive and Negative Affect Schedule em pessoas com esquizofrenia: características psicométricas

Abstract

Objective: to analyze the psychometric properties of the short form of the Portuguese version of the Positive and Negative Affect Schedule in people with schizophrenia. Methods: a Psychometric study was carried out, in a convenience sample, composed of 282 people with the diagnosis of schizophrenia. The psychometric properties were evaluated: validity (construct, criterion) and reliability (Cronbach's α) of the Portuguese short version of the Positive and Negative Affect Schedule. The criterion validity was used by WHOQOL-Bref. Results: the Portuguese short version of the Positive and Negative Affect Schedule has two distinct dimensions of positive affect (α=0.86) and negative affect (α=0.82). The two dimensions of positive and negative affect are associated with health-related quality of life. Conclusions: the Portuguese short version of the Positive and Negative Affect Schedule has similar psychometric properties to the original, being valid and reliable in people with schizophrenia. This scale is appropriate to be applied both in the clinical context and research in this population.