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What do systematic reviews say?

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Evidence found and GRADE certainty

4,721 questions · 19,640 findings · 2,039 reviews · Headline outcomes only

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No studies found 3,754 · 19.1%GRADE not reported 1,273 · 6.5%Very low 4,859 · 24.7%Low 5,568 · 28.4%Moderate 3,240 · 16.5%High 946 · 4.8%

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Opioid antagonists vs placebo

Nausea · preventing nausea and vomiting
2 findings from 1 review

Ginger vs placebo

Nausea · preventing nausea and vomiting

It is very uncertain whether ginger changes nausea ‐ intraoperative compared with placebo (very low certainty).

2 findings from 1 review

Probiotics vs placebo

Diagnosis of gestational diabetes · preventing gestational diabetes

Probiotics showed no clear difference in diagnosis of gestational diabetes mellitus compared with placebo (low certainty).

1 finding from 1 review

Probiotics vs placebo

Mortality or morbidity composite · preventing gestational diabetes

Probiotics showed no clear difference in mortality or morbidity composite compared with placebo (low certainty).

1 finding from 1 review