Appendix A.

Association between physician and practice characteristics and comfort with and attitudes about EHRs (non-standardized)

	Comfort with Computers		Positive Attitude about EHRs		Negative Attitude about EHRs
	Difference	p-value	Difference	p-value	Difference	p-value
Provider work load
<20 hours/wk	ref	0.31	ref	0.86	-0.07	0.40
≥20 hours/wk	0.09		0.01
Type of provider
MD or DO	ref	0.46	ref	0.21	ref	0.37
Non-MD (PA, NP)	−0.06		−0.16		−0.10
Provider Specialty
Family Practice	ref	0.77	ref	0.009	ref	0.31
Adult General Internal Medicine	−0.01		−0.20		−0.25
Pediatrics	−0.05		−0.02		−0.04
Obstetrics and Gynecology	−0.04		0.15		0.03
Other	0.11		−0.36		−0.04
Years in practice
0–5	ref	0.09	ref	0.23	ref	0.18
6–10	−0.05		0.13		−0.12
11–20	−0.21		−0.02		−0.18
>20	−0.11		0.02		−0.10
Gender
Female	ref	0.29	ref	0.14	ref	0.35
Male	−0.07		−0.07		−0.07