Table 1

Descriptive statistics and linear regression model for predicting use of electronic prescribing

PREDICTORS	DESCRIPTIVE STATISTICS AND CORRELATIONS				LINEAR REGRESSION MODEL TO PREDICT USAGE

	MEAN (SD)	MINIMUM	MAXIMUM	CORRELATION WITH USAGE	ESTIMATE	95% CI	P VALUE
Physicians’ perceptions and intentions
Perceived usefulness^*
• Average score of usefulness^†	4.26 (0.51)	3	5	0.08	0.03	−0.06 to 0.12	.57
Perceived ease of use
• MOXXI will be easy to use	4.13 (0.69)	2	5	0.19	0.05	−0.02 to 0.12	.14
Social influence
• Colleagues’ attitudes will be positive toward my use of MOXXI	4.08 (0.61)	3	5	0.11	0.03	−0.04 to 0.11	.40
Intention to use
• I will use MOXXI with most of my patients	4.49 (0.62)	2	5	−0.02	0.00	−0.08 to 0.07	.90
Physician characteristics
Male sex^‡	NA	NA	NA	0.19	0.07	−0.02 to 0.16	.15
Practice experience
• Graduation year	1982 (7.55)	1965	1999	−0.17	−0.004	−0.010 to 0.002	.18
Physician typology^§
• Pragmatist	NA	NA	NA	0.18	0.07	−0.03 to 0.16	.17
• Receptive	NA	NA	NA	0.10	−0.07	−0.20 to 0.06	.26
• Seeker	NA	NA	NA	−0.15	0.05	−0.08 to 0.17	.44
Previous computer experience
• No. of hours per week of computer use	5.67 (6.37)	0	30	0.45	0.01	0.01 to 0.02	< .001
Practice characteristics
Continuity of care^\|\|	0.57 (0.09)	0	1	−0.08	−0.17	−0.69 to 0.35	.52
Average medication use^¶	2.84 (0.83)	1	5	0.30	0.07	0.01 to 0.12	.02
Practice size	1840 (877)	19	3880	−0.17	0.00	0.00 to 0.00	.20
Practice volume^#	20.74 (7.26)	2	42	−0.17	0.00	−0.01 to 0.00	.19

MOXXI—medical office of the 21st century, NA—not applicable.
↵* Cronbach α = .90.
↵† Average score of usefulness is average of scores of 9 questions coming from perceived usefulness: 1) electronic prescribing will be useful; 2) electronic prescribing will make work easier; 3) electronic prescribing will have a beneficial effect on quality of patient care; 4) electronic prescribing will increase my professional satisfaction; 5) electronic prescribing will have a beneficial communication with other health care professionals; 6) electronic prescribing will improve continuity of care; 7) electronic prescribing will increase my professional autonomy; 8) electronic prescribing will increase patients’ satisfaction; and 9) electronic prescribing will have a minimal effect on depersonalizing patient care.
↵‡ Female sex was used as reference category.
↵§ Traditionalist was used as reference category.
↵|| Proportion of visits made to study physician for each patient in the practice in the 18 months before the study.
↵¶ No. of medications was counted for each patient in the 18 months before the study.
↵# Daily no. of patients seen based on the no. of patient visits during the 18 months before the study divided by the no. of days worked during that same period.