| Weighted event rates | |||||
| Population | Number of trials (n) | Cranberry | Control | RRR (95% CI) | NNT (CI) |
| All | 4 (665) | 12% | 19% | 34% (8 to 53) | 16 (11 to 68) |
| Women with recurrent UTI | 2 (241) | 22% | 37% | 39% (9 to 60) | 7 (5 to 31) |
| Elderly people | 1 (376) | 3.8% | 7.4% | 49% (−22 to 79) | Not significant |
| RRI (CI) | NNH | ||||
| People with spinal cord injury | 1 (48) | 39% | 36% | 6% (−49 to 121) | Not significant |
*Abbreviations defined in glossary. Weighted event rates, RRR, RRI, NNT, NNH, and CI calculated from data in article using a random-effects model.