Aspirin (81 or 325 mg daily) v placebo in patients with a recent history of histologically confirmed adenomas at ≥1 year‡
| Outcome | Comparisons | Event rates | RRR (95% CI) | NNT (CI) |
|---|---|---|---|---|
| ‡Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article. | ||||
| ≥1 colorectal adenoma detected | Aspirin, 81 mg v placebo | 38% v 47% | 19% (3.8 to 32) | 12 (7 to 60) |
| Aspirin, 325 mg v placebo | 45% v 47% | 4.3% (−12 to 18) | Not significant | |