Active warming v passive warming before insertion of peripheral venous cannulas (neurosurgical patients only)*

OutcomeActive warmingPassive warmingRBI (95% CI)NNT (CI)
*Abbreviations defined in glossary; RBI, NNT, and CI calculated from data in article.
Successful insertions on first attempts94%72%31% (10 to 62)5 (3 to 13)