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Major cardiovascular events (coronary heart disease and stroke) by systolic blood pressure at entry according to treatment with aspirin. Figures are numbers of events with rates per 1000 person years in parentheses and relative risks corrected for other risk factors (see table 1 for person years)
| Systolic blood pressure (mm Hg) | Aspirin | No aspirin | Relative risk | Interaction P value |
|---|---|---|---|---|
| <130 | 42 (7.7) | 64 (12.2) | 0.59 | |
| 130-145 | 48 (9.0) | 75 (14.0) | 0.68 | 0.0001 |
| >145 | 111 (20.5) | 99 (17.9) | 1.08 |
