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Evidence found and GRADE certainty

2,510 questions · 2,653 findings · 194 reviews · Gynaecology and Fertility

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No studies found 531 · 20%GRADE not reported 76 · 2.9%Very low 826 · 31.1%Low 855 · 32.2%Moderate 341 · 12.9%High 24 · 0.9%

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

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

Abnormal uterine bleeding · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes abnormal uterine bleeding 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

Adverse effects during treatment ‐ all effects · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes adverse effects during treatment ‐ all effects 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

Adverse events: nausea · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes adverse effects during treatment ‐ nausea 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

Adverse effects during treatment ‐ heaviness in lower abdomen · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes adverse effects during treatment ‐ heaviness in lower abdomen 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

Adverse effects during treatment ‐ pain in abdomen · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes adverse effects during treatment ‐ pain in abdomen compared with levonorgestrel intrauterine system (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

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