Lifestyle intervention (LI) or metformin plus standard lifestyle v placebo plus standard lifestyle for prevention of type 2 diabetes at 3 years*

OutcomeComparisonsEvent ratesRRR (95% CI)NNT (CI)
*Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article.
Incidence of diabetesLI v placebo14% v 29%50% (41 to 58)7 (6 to 10)
Metformin v placebo22% v 29%25% (13 to 35)14 (9 to 34)