evidencegaps
Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

257 questions · 270 findings · 42 reviews · Headline outcomes only

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No studies found 75 · 27.8%GRADE not reported 7 · 2.6%Very low 95 · 35.2%Low 50 · 18.5%Moderate 40 · 14.8%High 3 · 1.1%

Additional support vs usual care

Postnatal depression · women at increased risk of low birthweight babies (maternal outcomes)

Additional support showed no clear difference in postnatal depression Self‐reported compared with usual care during pregnancy (low certainty).

2 findings 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

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