Table 1.
Baseline characteristics of the 17 107 adults aged ≥65 years with unknown atrial fibrillation status
| Variable | 15 intervention practices | 16 control practices |
|---|---|---|
| Patient characteristics | ||
| Number of patients, n | 8581 | 8526 |
| Mean age, years (SD) | 74.3 (7.3) | 74.5 (7.3) |
| Females, n (%) | 4680 (54.5) | 4610 (54.1) |
|
| ||
| Medical history as collected in a random sample of 10% of both intervention and control groupa | ||
| Sample size of random samples, n | 867 | 848 |
|
| ||
| Comorbidities, n (%) | ||
| Hypertension | 441 (50.9) | 427 (50.4) |
| Type 2 diabetes | 172 (19.8) | 145 (17.1) |
| COPD | 70 (8.1) | 68 (8.0) |
| Prior myocardial infarction | 59 (6.8) | 57 (6.7) |
| Ischaemic strokeb | 34 (3.9) | 54 (6.4) |
| TIA | 40 (4.6) | 40 (4.7) |
a
Because of rounding at practice level, sample size is not an exact 10% in either the intervention or control arm.
b
Strokes were defined as either ischaemic or stroke of undefined origin. COPD = chronic obstructive pulmonary disease. SD = standard deviation. TIA = transient ischaemic attack.