Letter to Editor. New assessment of the validity of the Brief Measure to Assess Perception of Self-Influence on the Disease Course: A Version for Schizophrenia.

Introduction: Clinical observations suggest that the Brief Measure to Assess Perception of Self-Influence on the Disease Course: A Version for Schizophrenia has the better reliability, than presented in the original publication of the scale [1]. It is used in research and their results indicate moderate relations between the perception of the self-influence on schizophrenia course and social functioning as well as adherence to the recommended treatment. These circumstances justify and new assessment of the reliability of the scale.

Material And Methods: Detailed scale for competent judges, who had better opportunity for the comprehensive examination of 59 participants, 27 men and 29 women of age 22-72 lat (M = 40.69; SD = 11.85).

Results: The Spearman's correlation between the scores on the version for schizophrenia of the Brief Measure to Assess Perception of Self-Influence on the Disease Course and the assessment of the patients' perception of self-influence on the schizophrenia course by the competent judges rho was 0.56. Whereas, in the first study Pearson's r was 0.45.

Conclusions: Brief Measure to Assess Perception of Self-Influence on the Disease Course - Version for Schizophrenia has good enough validity, as for so brief scale. It can be used in research and clinical practice.