Validation studies of the OPCS scale — more useful than the Barthel Index?

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Abstract
The OPCS scales of disability were developed as a survey tool to estimate the prevalence of disability amongst adults in the UK. This study evaluates the use of the OPCS scales in a clinical setting. A total of 265 patients attending a rehabilitation unit and wheelchair centre were assessed. The OPCS scales were validated against the standard Barthel Index and sensitivity to change over time was examined. An inter-rater reliability study was also performed. The results showed good correlation between the OPCS scales and Barthel Index (0.82, p < 0.001, n = 265) and it was shown that the OPCS scales were sensitive to clinical change over a six-month period. Inter-rater reliability was also good (0.96, p < 0.001, n = 120). The 95% confidence limits were also examined. The 'ceiling' effect of the Barthel Index is not found in the OPCS scales of disability. The results of the study support further use of the OPCS scales and suggest that it has a place in the assessment of rehabilitation outcome.