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Evidence found and GRADE certainty

45 questions · 52 findings · 2 reviews

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No studies found 16 · 30.8%GRADE not reported 1 · 1.9%Very low 28 · 53.8%Low 5 · 9.6%Moderate 2 · 3.8%High 0 · 0%

Metformin vs diet and exercise or another antidiabetic drug

Intensive diet plus exercise Diagnostic criteria: 1 trial applied the WHO 1985 criteria (FPG < 7.8 mmol/L and 2‐hour glucose ≥ 7.8 mmol/L and < 11.1 mmol/L) (Fang 2004) · people at increased risk for developing type 2 diabetes

Summary of findings table for metformin showed no clear difference in intensive diet plus exercise Diagnostic criteria: 1 trial applied… compared with diet and exercise or another antidiabetic drug (moderate certainty).

1 finding from 1 review

Metformin vs diet and exercise or another antidiabetic drug

Acarbose Diagnostic criteria: 1 trial applied the WHO 1985 criteria (FPG < 7.8 mmol/L and 2‐hour glucose ≥ 7.8 mmol/L and < 11.1 mmol/L) (Fang 2004). 1 trial applied the WHO 1999 criteria (FPG ≥ 7.0 mmol/L and/or a 2‐hpur glucose ≥ 11.1 mmol/L aft... · people at increased risk for developing type 2 diabetes

Summary of findings table for metformin showed no clear difference in acarbose Diagnostic criteria: 1 trial applied the WHO 1985 criteria… compared with diet and exercise or another antidiabetic drug (low certainty).

1 finding from 1 review

Summary of findings table ‐ Metformin + megestrol vs megestrol

Progression of endometrial hyperplasia to endometrial cancer · endometrial hyerplasia

It is very uncertain whether summary of findings table ‐ Metformin + megestrol changes progression of endometrial hyperplasia to endometrial cancer compared with megestrol (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Metformin + megestrol vs megestrol

Regression of endometrial hyperplasia (with or without atypia) to proliferative, secretory, or atrophic endometrium · endometrial hyerplasia

Summary of findings table ‐ Metformin + megestrol may leads to higher regression of endometrial hyperplasia (with or without atypia) to… compared with megestrol (low certainty).

1 finding from 1 review

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

Summary of findings table ‐ Metformin + levonorgestrel (intrauterine system) vs levonorgestrel intrauterine system

Regression of endometrial hyperplasia (with or without atypia) to proliferative, secretory, or atrophic endometrium · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes regression of endometrial hyperplasia (with or without atypia) to… compared with levonorgestrel intrauterine system (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Metformin + levonorgestrel (intrauterine system) vs levonorgestrel intrauterine system

Hysterectomy rate · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes hysterectomy rate compared with levonorgestrel intrauterine system (very low certainty).

1 finding from 1 review