|Outcome||Comparisons||Event rates||RRR (95% CI)||NNT (CI)|
|*Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article.|
|Incidence of diabetes||LI v placebo||14% v 29%||50% (41 to 58)||7 (6 to 10)|
|Metformin v placebo||22% v 29%||25% (13 to 35)||14 (9 to 34)|
A lifestyle intervention or metformin prevented or delayed the onset of type 2 diabetes in people at risk
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