Interpractice variation in prevalence and treatment of atrial fibrillation in 211 general practices in England and Wales, 1994–1998
| Mean | Standard deviation | Minimum | Maximum | |
| Prevalence per 1000 | 11.5 | 4.4 | 0.7 | 25.2 |
| Percentage prescribed oral anticoagulants | 23.6 | 8.6 | 1.8 | 50.0 |
| Percentage prescribed aspirin | 30.1 | 8.0 | 8.1 | 61.6 |
| Number treated with anticoagulants per 1000 registered patients | 2.7 | 1.4 | 0.1 | 8.9 |