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Infection rates before and after introduction of protocol, subdivided by type of procedure
| Procedure type | Pre-protocol infection rate (%) | Post-protocol infection rate (%) | Relative risk | 95% confidence interval |
|---|---|---|---|---|
| Total | 24/442 (5.43%) | 12/367 (3.27%) | 0.602 | 0.31 to 1.19 |
| Primary | 7/193 (3.63%) | 4/157 (2.55%) | 0.702 | 0.21 to 2.36 |
| Revision | 17/249 (6.83%) | 8/210 (3.81%) | 0.558 | 0.25 to 1.27 |
