Intra-articular corticosteroid injections (ICI) v placebo for osteoarthritis of the knee*
| Outcomes | Number of studies (n) | Weighted event rates | RBI (95% CI) | NNT (CI) | |
|---|---|---|---|---|---|
| ICI | Placebo | ||||
| *Short term improvement = up to 2 weeks; long term improvement = 16–24 weeks. Other abbreviations defined in glossary; RBI, NNT, and CI calculated from data in article using a random effects model. | |||||
| Short term improvement | 6 (317) | 78% | 45% | 53% (21 to 93) | 4 (3 to 6) |
| Long term improvement | 2 (97) | 45% | 21% | 110% (20 to 266) | 5 (3 to 14) |