Table 1.

Baseline characteristics of pilot and comparison practices.

	Pilot (27 practices; 17921 attributed patients)	Comparison (29 practices; 12894 attributed patients)	P value*
Practice size	Median (IQR)
Number of PCPs	3 (1, 7)	3 (1, 4)	0.40
Main practice specialty	Number of practices
Family practice	10	12	0.39
Internal medicine	8	12
Mixed specialty**	9	5
Patient panel characteristics***	Median (IQR)
Number of attributed patients per practice	400 (213, 1002)	290 (170, 681)	0.29
% female	52 (49, 57)	54 (50, 61)	0.37
Median age among adults	46 (43, 50)	45 (42, 50)	0.98
% with age<17	10 (3, 20)	6 (2,21)	0.74
% diabetic	9 (7, 11)	8 (6, 9)	0.080
Mean Charlson score	1.25 (0.99, 1.80)	1.24 (1, 1.69)	0.77
% health plan A (commercial)	22 (0, 96)	33 (0, 42)	0.78
% health plan B (commercial)	78 (4, 100)	67 (57, 100)	0.78

Abbreviation: IQR, interquartile range; PCP, primary care physician or clinician (including MDs, DOs, and NPs).

^*Wilcoxon rank-sum test for counts, percentages, and other continuous variables; Pearson chi-square and Fisher exact tests for categorical variables. All variables are calculated at the practice level.

^**Any combination of family practice, internal medicine, and pediatrics.

^***Calculated at the practice level among patients attributed to study practices in the pre-intervention period based on plurality of qualifying visits.