Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,815 questions · 6,211 findings · 638 reviews · Headline outcomes only

No studies found 1,052 · 16.9%GRADE not reported 441 · 7.1%Very low 1,700 · 27.4%Low 1,651 · 26.6%Moderate 1,070 · 17.2%High 297 · 4.8%

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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

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

Metformin combined with clomiphene citrate vs clomiphene

Miscarriage · women with polycystic ovary syndrome

Metformin combined with clomiphene citrate showed no clear difference in miscarriage rate per woman compared with clomiphene citrate alone (low certainty).

2 findings from 2 reviews · compare the 2 reviews

Metformin combined with clomiphene citrate vs clomiphene

Live birth rate per woman · women with polycystic ovary syndrome

Metformin combined with clomiphene citrate showed no clear difference in live birth rate per woman compared with clomiphene citrate alone (low certainty).

2 findings from 2 reviews · compare the 2 reviews

Metformin combined with clomiphene citrate vs clomiphene

Gastrointestinal adverse events · women with polycystic ovary syndrome

Metformin combined with clomiphene citrate probably leads to higher adverse events (gastrointestinal) per woman compared with clomiphene citrate alone (moderate certainty).

2 findings from 2 reviews · compare the 2 reviews

Metformin combined with clomiphene citrate vs clomiphene

Clinical pregnancy rate · women with polycystic ovary syndrome

Metformin combined with clomiphene citrate probably leads to higher clinical pregnancy rate per woman compared with clomiphene citrate alone (moderate certainty).

2 findings from 2 reviews · compare the 2 reviews

Metformin combined with clomiphene citrate vs clomiphene

Ovulation rate · women with polycystic ovary syndrome

Metformin combined with clomiphene citrate may leads to higher ovulation rate per woman compared with clomiphene citrate alone (low certainty).

2 findings from 2 reviews · compare the 2 reviews

Oral methotrexate plus intra‐articular glucocorticoid vs intra‐articular glucocorticoid alone

Sustained clinically inactive diseasec · children and young people with JIA

Oral methotrexate plus intra‐articular glucocorticoid showed no clear difference in sustained clinically inactive diseaseb(12 months) compared with intra‐articular glucocorticoid alone (low certainty).

1 finding from 1 review