Table 2.

Characteristics of PCPs Who Responded to the Survey, by Study Site

Characteristic	BIDMC		GHS		HMC†
	Participating PCPs (n = 42), %	Nonparticipating PCPs (n = 12), %	Participating PCPs (n = 26*), %	Nonparticipating PCPs (n = 51), %	Participating PCPs (n = 42), %
Age
30–39 y	26	0	23	26	45
40–49 y	38	50	27	34	38
50–59 y	26	42	46	32	17
≥60 y	10	8	4	8	0
Women	50	42	23	42	62
Direct care hours per week
<115	43	42	8	2	73
15–35	45	42	46	26	19
36–62	12	17	46	72	7
How often PCPs communicate with patients by e-mail
Never	4	0	0	4	17
Less than once weekly	7	8	4	10	60
More than once weekly, but not daily	36	25	15	10	19
More than once daily	52	67	81	76	5

BIDMC = Beth Israel Deaconess Medical Center; GHS = Geisinger Health System; HMC = Harborview Medical Center; PCP = primary care physician.

^*Data were missing for 1 PCP survey respondent.

^†Only participating PCPs completed the survey at HMC.