Hospital composite quality scoring and rating methodology

Abstract

Methodology for user-friendly scoring and rating relative composite quality performance of hospital inpatient care uses various statistical methods. Hospitals are respectively assigned multiple z-values to identify relative statistical significance associated with a plurality of quality indicators for various clinical categories using available databases. Once so assigned, each z-value is converted to a z-score to rescale to a standard normal distribution. Such z-scores are converted to a percentile value which serves as the hospital's relative quality score for each quality indicator. Percentiles are then averaged across quality indicators to produce a raw composite percentile score, which is then rescaled to a standard normal distribution using a z-score transformation for appropriate statistical distribution and equal weighting. Such z-score is then converted to a final percentile value which serves as the hospital's terminal composite quality score, and which is assigned to a percentile-based reference range to determine a hospital's composite quality rating.

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