Table 1.
Baseline Characteristics of Patients Treated and Not Treated with Warfarin.
| Covariates | Total Cohort (N = 9113) | Warfarin Therapy | P value | |
|---|---|---|---|---|
| Yes (N = 5018) | No (N = 4095) | |||
| Mean CHADS2 score | 2.5 ± 0.8 | 2.5 ± 0.8 | 2.5 ± 0.8 | 0.38 |
| Age ≥ 75 years | 76.5 ± 9.9 | 76.3 ± 9.5 | 76.8 ± 10.4 | 0.45 |
| Age Categories (years) | 0.07 | |||
| < 70 | 21.1% | 21.4% | 20.9% | |
| 70 to 79 | 35.9% | 36.9% | 34.7% | |
| ≥ 80 | 43.0% | 41.8% | 44.4% | |
| Insurance type | <0.001 | |||
| Private | 61.9% | 60.4% | 63.8% | |
| Medicare | 33.7% | 34.4% | 32.9% | |
| Other public | 1.3% | 1.5% | 1.1% | |
| None | 3.0% | 3.6% | 2.2% | |
| Men | 51.3% | 52.6% | 49.7% | 0.005 |
| White | 87.2% | 87.1% | 87.3% | 0.80 |
| Coronary artery disease* | 47.4% | 45.6% | 49.6% | <0.001 |
| Dyslipidemia** | 60.8% | 62.9% | 58.3% | <0.001 |
| Diabetes mellitus | 37.1% | 36.8% | 37.5% | 0.50 |
| Hypertension*** | 93.4% | 93.8% | 93.0% | 0.14 |
| Prior Stroke/TIA | 10.3% | 9.9% | 10.7% | 0.18 |
| Congestive heart failure | 32.1% | 32.5% | 31.6% | 0.35 |
| Peripheral arterial disease | 6.1% | 5.1% | 7.3% | <0.001 |
| Prior systemic embolism | 2.1% | 2.8% | 1.1% | <0.001 |
| Stable angina pectoris | 5.1% | 4.9% | 5.3% | 0.39 |
| PCI with DES in past 12 months | 4.0% | 4.0% | 4.0% | 0.93 |
*
History of coronary artery stenosis ≥70%, PCI, or coronary artery bypass surgery
**
Assessed by individual physician, most commonly due to LDL > 130
***
Assessed by individual physician, most commonly due to persistently elevated systolic BP (>140) or diastolic BP (>90)
Abbreviations: DES, drug-eluting stent; TIA, transient ischemic attack; PCI, percutaneous coronary intervention.