Table 2.

PT/INR Measurements

	Manual Alerts	PHS Alerts	P value
Patients, n	3,497	3,781
Dose, Mean ± SD	2.96 ± 1.42	2.98 ± 1.50	0.503
Median	2.5	2.5
PT/INR measurements*	N = 30,981	N = 32,297	0.384+
Mean ± SD	2.02 ± 1.38	2.00 ± 1.28
Median	1.72	1.70
	Number (%)	Number (%)	0.369#
INR < 1.0	1,172 (4)	1,570 (5)
1.0-1.4	10,242 (33)	10,809 (33)
1.5-1.9	8,137 (26)	8,320 (26)
2.0-2.4	5,069 (16)	5,154 (16)
2.5-2.9	2,734 (9)	2,776 (9)
3.0-3.4	1,397 (5)	1,425 (4)
3.5-3.9	717 (2)	751 (2)
4.0-4.4	417 (1)	428 (1)
4.5-4.9	269 (1)	260 (1)
5.0-5.4	198 (1)	182 (1)
5.5-5.9	124 (<1)	127 (<1)
6.0-6.5	74 (<1)	80 (<1)
6.5-6.9	61 (<1)	58 (<1)
7.0-7.4	50 (<1)	45 (<1)
7.5-8.9	41 (<1)	41 (<1)
> 8.0	279 (1)	271 (1)

* Including outpatient, inpatient, and ED laboratory results; +Using Mann-Whitney U test; #using Fisher's exact test