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