Antibiotics v placebo in patients having appendectomy*

Weighted events rate
OutcomesNumber of comparisons (n)AntibioticsPlaceboRRR (95% CI)NNT (CI)
*Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article. A fixed effects model was used for all analyses. Follow up data were not consistently reported in individual trials.
Wound infection71 (8643)5.3%14.6%60% (55 to 65)11 (10 to 13)
Intra-abdominal abscess20 (4468)0.7%1.7%51% (18 to 70)100 (59 to 334)