Comprehensive reliability assessment and comparison of quality indicators and their components

Journal of Clinical Epidemiology
E D Huff

Abstract

To test whether conventional data reliability assessment overestimates reliability, an assessment and a comparison of the reliability of complex quality indicators and their simpler components were conducted. Medical records of 1078 Medicare cases with principal diagnoses of initial episodes of acute myocardial infarction (AMI) were independently reabstracted at two national Clinical Data Abstraction Centers (CDACs). The inter-rater agreement beyond chance (kappa) of reabstracted and original quality indicators and key components were computed and compared. Results showed excellent agreement (kappas ranging from 0.88 to 0.95) for simple determinations of whether standard medical therapies were provided. Repeatability of eligibility status and the more complex determinations of whether "ideal" candidates were not treated showed moderate to excellent kappa values ranging from 0.41 to 0.79. A planned comparison of five similar quality indicators and their key components showed that the simpler treatment components, as a group, had significantly higher kappas than the more complexly derived eligibility components and composite indicators (Fisher's exact, p < 0.02). Reliability assessment of quality indicators should be based upon t...Continue Reading

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