Self help v no self help for smoking cessation at longest follow up (range 6 to 24 mo)*

Weighted event rates
Number of studiesSelf helpNo self helpRBI (95% CI)NNT (CI)
*Abbreviations defined in glossary. RBI, NNT, and CI calculated from data in article. †Control group received no written materials.
105.1%4.5%8% (−8 to 27)Not significant
7†4.3%3.5%27% (2 to 58)123 (64 to 1771)