Indicator 9: Incidental appendectomy among elderly rate
Type: Provider level utilization
Definition: Provider level. Number of incidental appendectomies per 100 patients age 65 years or older undergoing intra-abdominal surgery.
Precision: Provider Level Provider Signal
 MeanStd DevStd Dev (1)Share (2)Univariate Ratio (3)MSX R2 (4)
     Unadjusted0.0270.0350.0190.0150.5540.670
     Demographics--0.0190.0180.5900.689
     APR-DRG--0.0190.0140.5540.673

From: APPENDIX 7, Empirical Evaluation Results Tables

Cover of Refinement of the HCUP Quality Indicators
Refinement of the HCUP Quality Indicators.
Technical Reviews, No. 4.
Davies SM, Geppert J, McClellan M, et al.
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