Table 3.
Demographics of Patients in Warfarin Knowledge
| n All | % All | n AF | % AF | |
|---|---|---|---|---|
| Age, y | ||||
| <65 | 78 | 68.4 | 47 | 67.1 |
| 65–74 | 17 | 14.9 | 10 | 14.3 |
| ≥ 75 | 19 | 16.7 | 13 | 18.6 |
| Gender | ||||
| Male | 62 | 54.4 | 39 | 55.7 |
| Female | 52 | 45.6 | 31 | 44.3 |
| Reason for warfarin therapy | ||||
| AF | 70 | 61.4 | ||
| Non‐AF | 44 | 38.6 | ||
| Prosthetic valve replacement | 28 | 24.6 | ||
| Intravenous thrombosis | 7 | 6.1 | ||
| Rheumatic heart disease | 5 | 4.4 | ||
| Protein C deficiency | 1 | 0.9 | ||
| Secondary MI prevention | 1 | 0.9 | ||
| Allergy to multiple antiplatelets | 1 | 0.9 | ||
| Others | 1 | 0.9 | ||
| Risk factors of stroke | ||||
| With CHF/LV dysfunction | 14 | 12.3 | 11 | 15.7 |
| With vascular disease | 18 | 15.8 | 12 | 17.1 |
| With HT | 35 | 30.7 | 23 | 32.9 |
| With DM | 24 | 21.1 | 20 | 28.6 |
| With stroke/TIA/thromboembolism history | 21 | 18.4 | 10 | 14.3 |
| Duration of warfarin use | ||||
| <1 year | 5 | 4.4 | 1 | 1.4 |
| 1–5 years | 27 | 23.7 | 19 | 27.1 |
| 5–10 years | 41 | 36.0 | 23 | 32.9 |
| >10 years | 33 | 28.9 | 21 | 30.0 |
| Not sure/missing | 8 | 7.0 | 6 | 8.6 |
| Frequency of INR checks | ||||
| Once a week | 2 | 1.75 | 1 | 1.4 |
| Twice a month | 3 | 2.63 | 3 | 4.3 |
| Once a month | 4 | 3.50 | 1 | 1.4 |
| Once every 2 months | 5 | 4.39 | 3 | 4.3 |
| Once every 3 months | 39 | 34.21 | 22 | 31.4 |
| Once every 4 months | 42 | 36.84 | 30 | 42.9 |
| Once every 5 months | 6 | 5.26 | 4 | 5.7 |
| Twice a year | 8 | 7.02 | 4 | 5.7 |
| Not sure | 5 | 4.39 | 2 | 2.9 |
| Whether INR met target in the past 12 months (2.0–3.0; 2.0–3.5 for patients with valve replacement) | ||||
| Yes | 31 | 27.2 | 20 | 28.6 |
| No | 82 | 71.9 | 50 | 71.4 |
| Missing | 1 | 0.9 | 0 | 0 |
Abbreviations: AF, atrial fibrillation; CHF, congestive heart failure; DM, diabetes mellitus; HT, hypertension; INR, international normalized ration; LV, left ventricular; MI, myocardial infarction; TIA, transient ischemic attack.