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Table 3 Vermont Blueprint for Health Risk-Adjustment Model Comparisons & Resulting Practice Level Coefficient of Variation, CY2014

From: Risk-adjustment methods for all-payer comparative performance reporting in Vermont

Model Adult Model Pediatric Model
r2 D = Log-Likelihood Ratio (p-value) Model Adjusted Practice Level Coefficient of Variation r2 D = Log-Likelihood Ratio (p-value) Model Adjusted Practice Level Coefficient of Variation
Total expenditures       
No adjustment N/A   18.5 N/A   23.4
Age and gender 0.028 8102 (p < .001) 14.8 0.008 647 (p < .001) 24.3
Age, gender, and CRG 0.265 79231 (p < .001) 13.0 0.253 22138 (p < .001) 19.3
Full model 0.293 10884 (p < .001) 11.7 0.352 11092 (p < .001) 11.4
Total expenditures excluding SMS       
No adjustment N/A   19.1 N/A   15.0
Age and gender 0.038 11116 (p < .001) 14.2 0.007 524 (p < .001) 15.3
Age, gender, and CRG 0.270 78242 (p < .001) 14.3 0.288 25982 (p < .001) 9.9
Full model 0.285 5779 (p < .001) 12.1 0.302 1622 (p < .001) 9.3
Total resource use excluding SMS       
No adjustment N/A   22.4 N/A   17.0
Age and gender 0.045 12904 (p < .001) 17.3 0.007 561 (p < .001) 17.4
Age, gender, and CRG 0.266 74684 (p < .001) 13.6 0.289 26054 (p < .001) 11.7
Full model 0.289 8805 (p < .001) 11.5 0.315 3003 (p < .001) 9.0
HEDIS composite (not adjusted)    5.4    7.8
  1. The r2 represents the percentage explained by the model at the patient level. The mode-adjusted practice-level coefficient of variation represents the degree of variability in rates between practices at the practice level, with a lower value indicating reduced variation