Use of self-report measures of anxiety and depression in outpatients with schizophrenia: Reliability and validity

The psychometrics of many self-report measures of anxiety and depression have been established for patients with anxiety disorders, but little is known about use of these measures in patients with psychotic disorders. This study examined psychometrics of commonly used self-report measures. Self-report measures and interviewer ratings were collected on 33 outpatients diagnosed with schizophrenia disorders. A sample of 46 patients with anxiety disorders completed the same self-report measures. Internal consistency was high for the self-report measures in both samples. Test-retest reliability was moderate to high. Scores on self-report measures were correlated with interviewer ratings and with scores on other self-report measures of similar constructs, supporting the convergent validity of the measures. Reliable and valid information about anxiety and depression can be obtained through administering the self-report measures to outpatients diagnosed with psychotic disorders. There was more overlap among measures than was expected, possibly because of poor discriminant validity. One explanation of this may be that anxiety constructs overlap more in patients with schizophrenia or related disorders than in non-psychotic populations.