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A proposed method for measuring change beyond symptoms.

D S Weiss, K N DeWitt, N B Kaltreider

    Archives of General Psychiatry
    |July 1, 1985
    PubMed
    Summary
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    The Patterns of Individual Change Scales demonstrate reliable and valid measurement of patient functioning beyond symptoms. These scales are essential for a comprehensive understanding of patient progress in clinical settings.

    Area of Science:

    • Psychometrics
    • Clinical Psychology
    • Behavioral Science

    Background:

    • The Patterns of Individual Change Scales (PICS) were developed to measure patient characteristics beyond symptomatic domains.
    • Previous reports established the initial rationale, development, and conceptualization of the PICS battery.
    • Empirical data supported the reliability and validity of the original PICS scales.

    Observation:

    • This study presents further reliability and validity data for the PICS battery using two new independent samples.
    • Interrater reliability coefficients were assessed and found to be of appreciable magnitude.
    • Discriminant validity and the factor structure of the PICS battery were examined.

    Findings:

    • The PICS scales demonstrated high interrater reliability in new samples.

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  • Factor analysis indicated that the scales effectively capture three distinct sources of variance.
  • Discriminant validity was supported, suggesting the scales measure unique aspects of patient functioning.

    • Implications:

    • The findings confirm the PICS battery as a reliable and valid tool for assessing patient functioning.
    • Measuring changes in patient functioning beyond symptoms is both necessary and feasible with the PICS.
    • These scales can enhance clinical assessments and treatment outcome evaluations by providing a broader perspective on patient progress.