|Outcome at mean 0.4–4.6 y||Comparisons||Number of trials (n)||Hazard ratio (95% CI)||NNT (credible interval)|
|*Abbreviations defined in glossary.|
|†Lifestyle interventions included diet, exercise, or both.|
|‡Oral diabetes drugs were acarbose, flumamine, glipizide, metformin, or phenformin.|
|Type 2 diabetes||Lifestyle v placebo†||10 (4452)||0.51 (0.44 to 0.60)||7 (5 to 9)|
|Oral diabetes drug v placebo‡||8 (4580)||0.70 (0.62 to 0.79)||11 (9 to 15)|
|Orlistat v placebo||2 (814)||0.44 (0.28 to 0.69)||6 (5 to 8)|
|Jiangtang bushen v placebo||1 (51)||0.32 (0.03 to 3.07)||Not significant|
Review: lifestyle or pharmacological interventions prevent or delay type 2 diabetes in people with impaired glucose tolerance
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