Table 1 Populations and samples.
| City I: AF training | City II: TIA training | North: AF training | South & West: TIA training | All: AF training | All: TIA training | |
|---|---|---|---|---|---|---|
| Populations | ||||||
| TIA audit | ||||||
| Number of practices | 20 | 20 | 13 | 24 | 33 | 44 |
| Total population | 74100 | 66700 | 92900 | 149400 | 167000 | 216100 |
| Proportion aged >70 | 0.058 | 0.078 | 0.118 | 0.107 | 0.091 | 0.098 |
| AF audit | ||||||
| Practices audited | 17 | 11 | 12 | 23 | 29 | 34 |
| Population | 66600 | 41400 | 90500 | 147800 | 157200 | 189200 |
| Proportion aged >70 | 0.060 | 0.077 | 0.112 | 0.108 | 0.090 | 0.101 |
| Samples | ||||||
| TIA audit | ||||||
| Recorded contacts | 61 | 114 | 317 | 414 | 378 | 528 |
| Referrals to clinic | 53 | 94 | 283 | 360 | 336 | 454 |
| AF audit | ||||||
| Records examined | 293 | 245 | 580 | 872 | 873 | 1117 |
| Sampling fraction (range across practices) | 1.0 | 1.0 | 0.15–1.0 | 0.12–1.0 | ||
| AF diagnoses found | 213 | 245 | 425 | 668 | 638 | 855 |
| Estimated number AF | 213 | 245 | 1049 | 1056 | 1262 | 1301 |
AF, atrial fibrillation; TIA, transient ichaemic attack.