Table 2.

Characteristics of Patients Eligible for at Least 1 of 17 Quality Measures on February 1, 2008, February 1, 2009, and February 1, 2010, Stratified by Race

	February 1, 2008	February 1, 2009	February 1, 2010	P Value*
Female, no. (%)
White	4,163/5,972  (70)	4,241/6,141  (69)	4,149/6,060  (68)	0.76
Black	2,389/2,947  (81)	2,484/3,065  (81)	2,490/3,092  (81)
P value†	<0.001	<0.001	<0.001
Age, mean (SD), years
White	54.9 (19.7)	55.7 (19.3)	56.6 (19.4)	0.48
Black	54.8 (25.9)	55.6 (25.3)	56.3 (25.6)
P value†	0.82	0.87	0.36
Number of chronic medical conditions, ‡mean (SD)
White	0.97 (0.015)	1.03 (0.015)	1.10 (0.015)	0.92
Black	1.36 (0.022)	1.42 (0.022)	1.48 (0.023)
P value†	<0.001	<0.001	<0.001

^*P value for race-time interaction term from linear regression models (for age and number of chronic medical conditions) and logistic regression model (for gender) with time, race, and an interaction term for time and race as the independent variables

^†P value for comparison of white and black patients at each time point using chi-square test for categorical variables and t-test for continuous variables

^‡Number of chronic medical conditions is based on a count of ten chronic disease categories, nine categories included in the 2008 Dartmouth Atlas of Health Care (cancer, chronic pulmonary disease, coronary artery disease, congestive heart failure, peripheral vascular disease, severe chronic liver disease, diabetes, renal failure, and dementia) and hypertension