Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

966 questions · 1,015 findings · 90 reviews · Headline outcomes only

No studies found 256 · 25.2%GRADE not reported 62 · 6.1%Very low 271 · 26.7%Low 269 · 26.5%Moderate 111 · 10.9%High 46 · 4.5%

Summary of findings table for metformin plus intensive diet and exercise vs intensive diet and exercise

Development of type 2 diabetes · people at increased risk for developing type 2 diabetes

It is very uncertain whether summary of findings table for metformin plus intensive diet and… changes incidence of type 2 diabetes mellitus (N) Diagnostic criteria: 2… compared with intensive diet and exercise (very low certainty).

1 finding from 1 review

Adverse event outcomes for dietary combined with physical activity interventions vs usual care

All‐cause mortality · people at increased risk for developing type 2 diabetes

It is very uncertain whether diet plus physical activity changes all‐cause mortality compared with standard treatment (very low certainty).

1 finding from 1 review

Adverse event outcomes for dietary combined with physical activity interventions vs usual care

Development of type 2 diabetes · people at increased risk for developing type 2 diabetes

Diet plus physical activity probably leads to lower incidence of type 2 diabetes mellitus Diagnostic criteria: 3 trials… compared with standard treatment (moderate certainty).

1 finding from 1 review

Adverse event outcomes for dietary combined with physical activity interventions vs usual care

Cardiovascular mortality · people at increased risk for developing type 2 diabetes

It is very uncertain whether diet plus physical activity changes cardiovascular mortality compared with standard treatment (very low certainty).

1 finding from 1 review