Absolute risk, harm, odds ratios (OR), and 95% confidence intervals (CI) for best overall estimate of haemorrhage, major bleeds, bleeds requiring transfusion, and non-minor bleeds
| Absolute risk in control group (%/year) | Absolute harm from aspirin (%/year) | OR | 95% CI | |
| Best overall estimate of haemorrhage | ||||
| US4 | 0.05 | 0.04 | 1.70 | 1.08 to 2.66 |
| UK10 | 0.10 | 0.01 | 1.05 | 0.49 to 2.21 |
| TPT5 | 0.46 | 0.23 | 1.53 | 1.01 to 2.32 |
| HOT6 | 0.18 | 0.16 | 1.90 | 1.42 to 2.54 |
| Weighted mean | 0.13 | 0.09 | 1.69 | 1.38 to 2.07 |
| Major non-cerebral bleeds | ||||
| US4 | 0.05 | 0.04 | 1.70 | 1.08 to 2.66 |
| TPT5 | 0.05 | 0.05 | 1.96 | 0.63 to 6.09 |
| Weighted mean | 0.05 | 0.04 | 1.73 | 1.14 to 2.63 |
| Non-minor bleeds | ||||
| TPT5 | 0.46 | 0.23 | 1.53 | 1.01 to 2.32 |
| HOT6 | 0.18 | 0.16 | 1.96 | 1.42 to 2.54 |
| Weighted mean | 0.22 | 0.18 | 1.77 | 1.40 to 2.25 |