Smoking intervention v usual care in elective knee or hip replacement‡
| Outcomes to time of discharge | Intervention | Usual care | RRR (95% CI)§ | NNT (CI) |
|---|---|---|---|---|
| ‡Abbreviations defined in glossary. | ||||
| §CI calculated from data in article. | ||||
| Any postoperative complication | 18% | 52% | 65% (42 to 83) | 3 (2 to 6) |
| Wound related postoperative complication | 5% | 31% | 83% (48 to 95) | 4 (2 to 8) |