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Evaluating reliability. A cost-effectiveness approach.

A J Hogan

    Evaluation & the Health Professions
    |August 8, 1986
    PubMed
    Summary
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    This study quantifies misclassification costs in nursing home patient classification. Using these costs, the weighted kappa demonstrated favorable reliability for a functional assessment instrument, unlike the unweighted kappa.

    Area of Science:

    • Gerontology and Health Services Research
    • Health Economics and Outcomes Research

    Background:

    • Nursing home patient classification systems are crucial for resource allocation and care planning.
    • Misclassification errors in these systems can lead to significant economic consequences.
    • Assessing the reliability of functional assessment instruments is vital for accurate patient categorization.

    Purpose of the Study:

    • To derive the economic costs associated with misclassification in nursing home patient classification.
    • To utilize these economic costs as weights for estimating the reliability of a functional assessment instrument.
    • To compare the reliability estimates obtained using weighted versus unweighted kappa statistics.

    Main Methods:

    • Economic costs of misclassification were calculated for nursing home patient classification systems.

    Related Experiment Videos

  • A functional assessment instrument was applied to 290 Veterans Administration nursing home patients.
  • Weighted kappa statistics were employed to measure the reliability of the assessment instrument, incorporating economic cost weights.

    • Main Results:

    • The weighted kappa analysis indicated generally favorable reliability for the functional assessment instrument.
    • Conversely, the unweighted kappa analysis revealed significant reliability problems.
    • The findings highlight the impact of economic costs on reliability estimation in patient classification.

    Conclusions:

    • Reliability assessment of functional instruments should incorporate economic costs of misclassification.
    • The weighted kappa offers a more nuanced and economically relevant measure of reliability.
    • Reliability must be redefined and remeasured for each new application of an assessment instrument.