Table 1.
Characteristics of Patients with Diagnoses of Atrial Fibrillation and Warfarin Use Rate
| Characteristic | Pts., n (%) | Warfarin Use (%) | p Valuea |
|---|---|---|---|
| Overall | 41,447 (100) | 66.8 | |
| Age in 2008, years | |||
| 66–69 | 4,283 (10.3) | 70.2 | |
| 70–74 | 7,060 (17.0) | 71.3 | |
| 75–79 | 9,287 (22.4) | 70.3 | |
| 80–84 | 9,817 (23.7) | 68.3 | |
| 85–89 | 7,175 (17.3) | 62.6 | |
| 90–94 | 3,088 (7.5) | 53.3 | |
| ≥95 | 737 (1.8) | 38.9 | <0.001 |
| Race/ethnicity | |||
| non-Hispanic white | 37,770 (91.1) | 67.3 | |
| black | 1,532 (3.7) | 59.0 | |
| Hispanic | 1,205 (2.9) | 64.6 | |
| other/unknown | 940 (2.3) | 60.9 | <0.001 |
| Sex | |||
| male | 16,404 (39.6) | 68.7 | |
| female | 25,043 (60.4) | 65.6 | <0.001 |
| Census division | |||
| New England | 2,874 (6.9) | 69.7 | |
| Middle Atlantic | 6,350 (15.3) | 67.6 | |
| East North Central | 6,642 (16.0) | 68.5 | |
| West North Central | 3,929 (9.5) | 71.6 | |
| South Atlantic | 8,145 (19.7) | 65.2 | |
| East South Central | 2,967 (7.2) | 65.3 | |
| West South Central | 4,203 (10.1) | 62.7 | |
| Mountain | 1,854 (4.5) | 68.6 | |
| Pacific | 4,483 (10.8) | 64.2 | <0.001 |
| Contraindications for warfarin in 2007 | |||
| 0 | 34,947 (84.3) | 68.6 | |
| 1 | 5,745 (13.9) | 58.2 | |
| ≥2 | 755 (1.8) | 51.3 | <0.001 |
| Cardiologist visit in 2007 | |||
| no | 15,921 (38.4) | 64.1 | |
| yes | 25,526 (61.6) | 68.5 | <0.001 |
| Medicaid eligibility in 2008 | |||
| no | 32,432 (78.2) | 68.3 | |
| yes | 9,015 (21.8) | 61.3 | <0.001 |
| Elixhauser comorbidity score | |||
| 0 | 3,090 | 74.0 | 0 |
| 1–2 | 15,524 (37.5) | 70.0 | 1 |
| 3–4 | 12,145 (29.3) | 67.1 | ≥2 |
| ≥5 | 10,688 (25.8) | 59.8 | <0.001 |
| PCP visit in 2007 | |||
| no | 12,689 (30.6) | 63.0 | |
| yes | 28,758 (69.4) | 68.5 | <0.001 |
| CHADS2 score in 2007b | |||
| 0 | 1,903 (5.5) | 69.3 | |
| 1 | 7,398 (21.2) | 71.0 | |
| ≥2 | 25,646 (73.4) | 67.8 | <0.001 |
CHADS2 = congestive heart failure, hypertension, age, diabetes, and stroke or transient ischemic attack; PCP = primary care physician.
a
χ2 Test.
b
Use rates in this category were from patients without contraindication for warfarin.