Anticoagulation Control in Older Atrial Fibrillation Patients Receiving Vitamin K Antagonist Therapy for Stroke Prevention
Table 2
Measures of anticoagulation control among the overall population and in patients aged ≥80 and < 80 years.
N (%)
Total, N = 991
Age ≥80, N = 205
Age <80, N = 786
value
Mean TTR (SD)
66.6 (13.2)
66.6 (13.8)
66.6 (13.1)
1.00
TTR <70%
550 (55.5)
114 (55.6)
436 (55.5)
1.00
TTR ≥70%
441 (44.5)
91 (44.4)
350 (44.5)
Mean PINRR (SD)
57.6 (11.2)
57.1 (11.6)
57.7 (11.1)
0.54
PINRR <70%
851 (85.9)
176 (85.9)
675 (85.9)
1.00
PINRR ≥70%
140 (14.1)
29 (14.1)
111 (14.1)
Mean (SD) number of visits
58.7 (25.5)
51.2 (22.7)
60.7 (25.8)
<0.001
Mean (SD) percentage of INRs <2
25.7 (10.0)
26.6 (9.8)
25.5 (24.5)
0.17
Mean (SD) percentage of INRs >3
16.6 (7.2)
16.4 (15.6)
16.7 (7.1)
0.60
INR >5
293 (29.6)
70 (34.1)
223 (28.4)
0.13
INR >8
41 (4.1)
10 (4.9)
31 (3.9)
0.69
Median (IQR) years of follow-up
5.2 (3.2–7.0)
4.4 (2.6–6.2)
5.7 (3.3–7.1)
<0.001
INR: International Normalised Ratio; IQR: interquartile range; PINRR: percentage of INRs within range; SD: standard deviation; TTR: time in therapeutic range.
