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What do systematic reviews say?

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Evidence found and GRADE certainty

327 questions · 337 findings · 47 reviews · Headline outcomes only

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No studies found 69 · 20.5%GRADE not reported 35 · 10.4%Very low 49 · 14.5%Low 73 · 21.7%Moderate 63 · 18.7%High 48 · 14.2%

Primary care screening vs secondary care screening

Gestational diabetes · pregnant women, excluding women already diagnosed with GDM in this pregnancy and those with pre‐existing diabetes mellitus

Primary care screening showed no clear difference in gestational diabetes mellitus compared with secondary care screening (low certainty).

1 finding from 1 review

Primary care screening vs secondary care screening

Hypertensive disorders of pregnancy: hypertension · pregnant women, excluding women already diagnosed with GDM in this pregnancy and those with pre‐existing diabetes mellitus

Primary care screening showed no clear difference in hypertensive disorders of pregnancy: hypertension compared with secondary care screening (low certainty).

1 finding from 1 review

Primary care screening vs secondary care screening

Hypertensive disorders of pregnancy: pre‐eclampsia · pregnant women, excluding women already diagnosed with GDM in this pregnancy and those with pre‐existing diabetes mellitus

Primary care screening showed no clear difference in hypertensive disorders of pregnancy: pre‐eclampsia toxemia compared with secondary care screening (low certainty).

1 finding from 1 review

Primary care screening vs secondary care screening

Caesarean section · pregnant women, excluding women already diagnosed with GDM in this pregnancy and those with pre‐existing diabetes mellitus

Primary care screening showed no clear difference in caesarean birth compared with secondary care screening (low certainty).

1 finding from 1 review

Primary care screening vs secondary care screening

Large‐for‐gestational age · pregnant women, excluding women already diagnosed with GDM in this pregnancy and those with pre‐existing diabetes mellitus

Primary care screening showed no clear difference in large‐for‐gestational age compared with secondary care screening (low certainty).

1 finding from 1 review

Primary care screening vs secondary care screening

Perinatal mortality · pregnant women, excluding women already diagnosed with GDM in this pregnancy and those with pre‐existing diabetes mellitus

It is very uncertain whether primary care screening changes perinatal mortality compared with secondary care screening (very low certainty).

1 finding from 1 review

Primary care screening vs secondary care screening

Neonatal mortality or morbidity composite: neonatal complications · pregnant women, excluding women already diagnosed with GDM in this pregnancy and those with pre‐existing diabetes mellitus

Primary care screening showed no clear difference in neonatal mortality or morbidity composite: neonatal complications compared with secondary care screening (low certainty).

1 finding from 1 review

Primary care screening vs secondary care screening

Hypoglycaemia · pregnant women, excluding women already diagnosed with GDM in this pregnancy and those with pre‐existing diabetes mellitus

It is very uncertain whether primary care screening changes hypoglycaemia compared with secondary care screening (very low certainty).

1 finding from 1 review