Combined 1% permethrin creme rinse (PER) and trimethoprim/sulfamethoxazole v PER alone for cure of head lice infestation in children‡

OutcomesCombinedPERRBI (95% CI)NNT (CI)
‡Abbreviations defined in glossary; RBI, NNT, and CI calculated from data in article.
Cure at 2 weeks95.0%79.5%19.5% (1.1 to 48.4)7 (4 to 117)
Cure at 4 weeks92.5%71.8%28.8% (5.3 to 66.2)5 (3 to 25)