Table 2 Proportion of patient time (95 % confidence intervals) within International Normalized Ratio (INR) ranges for randomly selected patients started on, and established on, warfarin treatment for chronic atrial fibrillation. The standard INR range is 2.0 to 3.0, but there were some individual ranges.
Started on warfarin (N = 25) | Established on warfarin (N = 24) | |||
|---|---|---|---|---|
Treatment intervals (INR) | 1st month | 2nd month | 3rd month | |
Super therapeutic (>3.0) | 17.0 (7.9–26.1) | 14.4 (6.6–22.2) | 9.9 (1.3–18.5) | 18.8 (8.0–29.7) |
Therapeutic (2.0 – 3.0) | 54.2 (42.1–66.4) | 66.9 (54.3–79.7) | 75.4 (61.1–89.8) | 70.2 (59.9–80.4) |
Sub therapeutic (<2.0) | 28.7 (15.8–41.5) | 18.6 (6.7–30.5) | 14.6 (2.3–27.0) | 11.0 (4.2–17.8) |