TABLE 1.

Characteristics of Physicians Who Enrolled in an Internet-Delivered Educational Study: The MI-Plus Study, 2004–2006

Characteristica	Number in Pool	Percent of Pool (Column %)	Number Enrolled	Percent Enrolled (Row %)	P (for Differences in Enrollment)
All	1337	100.0%	177	13.2%
MD sex					0.053
Male	1075	80.4%	152	14.1%
Female	262	19.6%	25	9.5%
MD race					0.5
White	939	70.2%	124	13.2%
African-American	104	7.8%	10	9.6%
Asian	113	8.5%	19	16.8%
Other/unknown	181	13.5%	24	13.3%
MD age					0.2
<45	480	35.9%	61	12.7%
45–54	511	38.2%	67	13.1%
55–64	243	18.2%	40	16.5%
65+	102	7.6%	9	8.8%
Mean ± SD (range)	48.6 ± 10.2 (29–81)		48.7 ± 9.8 (29–81)
Practice: specialty					0.09
Internal medicine	623	46.6%	93	14.9%
Family/general practitioner	714	53.4%	84	11.8%
Practice: number of MDs in groupb					0.7
1	406	30.4%	57	14.0%
2–3	419	31.3%	53	12.6%
≥4	464	34.7%	63	13.6%
Median (range)	3 (1–372)		3 (1–199)
Practice: location					0.046
Urban	970	72.6%	117	12.1%
Rural	367	27.4%	60	16.3%
Number of post-MI patientsc					0.009
0–19	453	33.9%	42	9.3%
20–45	436	32.6%	65	14.9%
≥46	448	33.5%	70	15.6%
Median (range)	31 (0–420)		40 (0–154)

^aMissing data: age, 1; size, 48.

^bThirty-nine general practice.

^cTertiles.