Mechanical bowel preparation v no preparation before elective colorectal surgery*
| Outcomes at 7–60 days | Mechanical bowel preparation | No preparation | RRI (95% CI) | NNH (CI) |
|---|---|---|---|---|
| *Abbreviations defined in glossary; RRI, NNH, and CI calculated from odds ratio reported in article (fixed effects model). | ||||
| Anastomotic leakage | 5.6% | 3.2% | 71% (5 to 173) | 44 (18 to 638) |