Table 3.

Indices of Anticoagulation Attainment and Maintenance by Kidney Transplant status among Warfarin Users with a Therapeutic INR Range of 2–3

Characteristic	Patients without Kidney Transplants (n=1630)	Kidney Transplant Recipients (n=65)	p Value
Time to first therapeutic INR (days)	19.2 ± 26.2	13.5 ± 20.3	0.033
Follow-up/patient (months)	16.4 ± 10.6	14.0 ± 8.7	0.046
Total no. of visits/patient/month	2.26 ± 1.96	2.74 ± 1.26	< 0.005
Percentage of time below therapeutic range (PTBR)	28.2 ± 26.7	35.4 ± 29.0	0.029
Percentage of time in therapeutic range (PTTR)	48.7 ± 47.4	46.3 ± 41.5	0.34
Percentage of time above therapeutic range (PTAR)	18.0 ± 16.9	18.5 ± 14.8	0.8
Poor anticoagulation control (PTTR < 60)	1023 (62.8)	47 (72.3)	0.11
Good anticoagulation control (PTTR ≥ 60)	607 (37.2)	18 (27.7)

Data are mean ± SD values or no. (%) of patients.

INR = international normalized ratio.