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Disability scales: assessment of reliability.

Archives of Physical Medicine and Rehabilitation

|April 1, 1986

Summary

Correlation coefficients can overestimate agreement in disability scale reproducibility. The kappa statistic is essential for accurately assessing agreement between observers for activities of daily living (ADL) scales.

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Area of Science:

Rehabilitation Medicine
Biostatistics
Health Outcomes Research

Background:

Assessing the validity and reproducibility of disability scales is crucial for reliable patient evaluation.
Existing methods like correlation coefficients may not accurately reflect true agreement in disability assessments.

Purpose of the Study:

To evaluate the reliability of disability scales, specifically focusing on inter-observer variability.
To compare the effectiveness of correlation coefficients versus the kappa statistic in assessing scale reproducibility.

Main Methods:

A 31-point activities of daily living (ADL) index was used to measure disability in chronic disease patients.
Scores were independently rated by two observers.
Reproducibility was assessed using correlation coefficients and the kappa statistic.

Main Results:

High correlation (r = 0.962) was observed between observers, suggesting good validity.
However, the kappa statistic revealed poor overall agreement (36.3%), indicating significant disagreements.
Correlation coefficients overestimated the true agreement between the two sets of observations.

Conclusions:

The correlation coefficient can be misleading and may conceal significant disagreements in disability scale reproducibility.
The kappa statistic provides a more accurate measure of agreement by correcting for chance.
The kappa statistic is recommended for assessing the reproducibility of disability scales, including those with multiple categories.

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