Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

45 questions · 52 findings · 2 reviews

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 megestrol

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 changes regression of endometrial hyperplasia (with or without atypia) to… compared with megestrol (very low certainty).

1 finding from 1 review

Metformin vs megestrol

Hysterectomy rate · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin changes hysterectomy rate compared with megestrol (very low certainty).

1 finding from 1 review

Metformin vs megestrol

Abnormal uterine bleeding · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin changes abnormal uterine bleeding compared with megestrol (very low certainty).

1 finding from 1 review

Metformin vs megestrol

Adverse effects during treatment ‐ not reported · endometrial hyperplasia

The review found no eligible studies for this question.

1 finding from 1 review

Metformin vs diet and exercise or another antidiabetic drug

Thiazolidinediones Diagnostic criteria: 2 trials applied the WHO 1999 criteria (FPG ≥ 7.0 mmol/L and/or a 2‐hour glucose ≥ 11.1 mmol/L after a 75 g OGTT) (Jin 2009; Zeng 2013). No medical association recommended the cut‐off points applied in Maji ... · people at increased risk for developing type 2 diabetes

Summary of findings table for metformin showed no clear difference in thiazolidinediones Diagnostic criteria: 2 trials applied the WHO… compared with diet and exercise or another antidiabetic drug (low certainty).

1 finding from 1 review

Metformin vs diet and exercise or another antidiabetic drug

Intensive diet plus exercise · people at increased risk for developing type 2 diabetes
4 findings from 1 review
Show 1 more finding

Metformin vs diet and exercise or another antidiabetic drug

Acarbose · people at increased risk for developing type 2 diabetes
3 findings from 1 review

Metformin vs diet and exercise or another antidiabetic drug

Thiazolidinediones · people at increased risk for developing type 2 diabetes
2 findings from 1 review

Metformin vs diet and exercise or another antidiabetic drug

Placebo or diet and exercise · people at increased risk for developing type 2 diabetes
2 findings from 1 review

Metformin vs diet and exercise or another antidiabetic drug

Placebo or diet and exercise Description: SF‐36 to evaluate the health utility index SF‐6D (physical component summaries and mental component summaries) Minimal important difference: difference in scores between groups of at least 3% · people at increased risk for developing type 2 diabetes
1 finding from 1 review

Metformin vs diet and exercise or another antidiabetic drug

Placebo or diet and exercise Diagnostic criteria: 3 trials applied the WHO 1985 criteria (FPG <7.8 mmol/L and 2‐hour glucose ≥7.8 mmol/L and <11.1 mmol/L after a 75 g OGTT) (Fang 2004; Li 1999; Lu 2002). 5 trials applied the WHO 1999 criteria (FPG... · people at increased risk for developing type 2 diabetes

Summary of findings table for metformin probably leads to lower placebo or diet and exercise Diagnostic criteria: 3 trials applied… compared with diet and exercise or another antidiabetic drug (moderate certainty).

1 finding from 1 review