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The Pain Disability Index: psychometric and validity data.

R C Tait, C A Pollard, R B Margolis

    Archives of Physical Medicine and Rehabilitation
    |July 1, 1987
    PubMed
    Summary
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    Psychological Factors in the Assessment of Disability among Patients with Chronic Pain.

    Journal of back and musculoskeletal rehabilitation·2014

    The Pain Disability Index (PDI) effectively measures pain-related disability. Studies confirm its internal consistency and validity, supporting its use in clinical settings for assessing functional limitations.

    Area of Science:

    • Rehabilitation Medicine
    • Psychometrics
    • Pain Management

    Background:

    • Pain-related disability assessment is crucial for comprehensive patient care.
    • Existing measures may not fully capture the impact of pain on daily functioning.
    • The Pain Disability Index (PDI) was developed as a concise tool to complement physical impairment assessments.

    Purpose of the Study:

    • To evaluate the psychometric properties of the Pain Disability Index (PDI).
    • To assess the validity of the PDI in distinguishing between different patient groups.
    • To provide evidence supporting the reliable use of the PDI in clinical practice.

    Main Methods:

    • Study I: Internal consistency (Cronbach's alpha) and factor analysis of PDI scores in 108 patients.
    • Study II: Comparison of PDI scores between former inpatients (n=37) and outpatients (n=36) via follow-up questionnaire.

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  • Statistical analysis to determine reliability and validity indicators.

    • Main Results:

    • PDI demonstrated strong internal consistency (alpha = .86) in Study I.
    • Factor analysis revealed two distinct dimensions of disability: discretionary and basic daily activities.
    • Study II showed significantly higher PDI scores in former inpatients compared to outpatients, supporting discriminant validity.

    Conclusions:

    • The Pain Disability Index (PDI) is a psychometrically sound instrument for assessing pain-related disability.
    • Findings support the PDI's validity and its utility in complementing physical impairment evaluations.
    • The PDI can differentiate functional limitations across patient populations, aiding clinical decision-making.