Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,752 questions · 6,648 findings · 688 reviews

No studies found 1,125 · 16.9%GRADE not reported 670 · 10.1%Very low 1,796 · 27%Low 1,685 · 25.3%Moderate 1,075 · 16.2%High 297 · 4.5%

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Metformin vs placebo or no treatment

Gastrointestinal adverse events · Women with polycystic ovary syndrome, oligo amenorrhoea and subfertility

Metformin probably leads to higher adverse events (gastrointestinal) per woman compared with placebo or no treatment (moderate certainty).

1 finding from 1 review

Metformin vs placebo or no treatment

Clinical pregnancy rate · Women with polycystic ovary syndrome, oligo amenorrhoea and subfertility

Metformin probably leads to higher clinical pregnancy rate per woman compared with placebo or no treatment (moderate certainty).

1 finding from 1 review

Methadone vs morphine

Patient‐reported pain intensity or pain relief (VAS, NRS or categorical scale) · people with cancer pain

Methadone may leads to higher participant‐reported pain intensity compared with morphine (low certainty).

1 finding from 1 review

Methadone vs morphine

Adverse events: appetite, thirst, somnolence · people with cancer pain
1 finding from 1 review

Metronidazole + SRP vs Amoxicillin + metronidazole + SRP

Clinical attachment level (CAL) · Adults with periodontitis (chronic and aggressive)

Metronidazole + SRP showed no clear difference in clinical attachment level (CAL) compared with amoxicillin + metronidazole + SRP; GRADE not reported.

2 findings from 1 review

Metronidazole + SRP vs Amoxicillin + metronidazole + SRP

Adverse events · Adults with periodontitis (chronic and aggressive)

Metronidazole + SRP showed no clear difference in adverse events compared with amoxicillin + metronidazole + SRP; GRADE not reported.

1 finding from 1 review

Metronidazole + SRP vs Amoxicillin + metronidazole + SRP

Probing pocket depth · Adults with periodontitis (chronic and aggressive)

Metronidazole + SRP showed no clear difference in probing pocket depth compared with amoxicillin + metronidazole + SRP; GRADE not reported.

2 findings from 1 review

Metronidazole + SRP vs Amoxicillin + metronidazole + SRP

Percentage of bleeding on probing (BOP) · Adults with periodontitis (chronic and aggressive)

Metronidazole + SRP showed no clear difference in percentage of bleeding on probing (BOP) compared with amoxicillin + metronidazole + SRP; GRADE not reported.

2 findings from 1 review