Table 3.

Single-disease and overall composite measures evaluated at primary care physician (PCP) level.

Composite Measure	Total Number of Measure Observations	Measure Adherence	Measures per PCP Mean (range)	Casemix- Adjusted PCP ICC* (SE)	Panel Needed for 80% Reliability†	PCPs with Adequate Panel Size‡
Diabetes	85,709	72.5%	575 (10-2,478)	1.9 (0.4)§	205	74.5%
CHF	4,967	81.6%	38 (3-168)	1.2 (0.9)	--	--
Ischemic Vascular Disease	15,949	76.2%	112 (5-641)	0.8 (0.4)§	530	2.1%
Prevention	72,326	72.8%	444 (2-1,877)	3.2 (0.5)§	120	76.7%
Overall	164,765	73.4%	1,011 (2-3,925)	5.4 (1.2)§	71	85.3%

^*The “Case-mix-adjusted PCP ICC” (primary care physician intra-class correlation coefficient) is the amount of total variance in the composite score that is due to differences between PCPs after controlling for patient factors, measure factors, grouping by practice site, and random measurement error.

^†The panel size needed to obtain 80% reliability in a PCP's score for a single-disease or overall composite using the case-mix-adjusted ICC and the Spearman-Brown Prophecy Formula.

^‡Percent of PCPs with an adequate panel size to achieve 80% reliability for single-disease or overall composite measures.

^§Denotes statistically significant ICCs.