Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,760 questions · 8,065 findings · 1,036 reviews

No studies found 1,686 · 20.9%GRADE not reported 675 · 8.4%Very low 1,953 · 24.2%Low 2,048 · 25.4%Moderate 1,296 · 16.1%High 407 · 5%

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Endometrial injury vs control

Miscarriage per woman randomised (studies at low risk of selection bias and other bias) · women undergoing assisted reproduction

Endometrial injury showed no clear difference in miscarriage per woman randomised (studies at low risk of selection… compared with control (moderate certainty).

1 finding from 1 review

Fresh vs frozen embryo transfers

Small for gestational age (birth weight below 10th percentile): after first ET · women undergoing assisted reproduction

It is very uncertain whether fresh changes small for gestational age (birth weight below 10th percentile):… compared with frozen embryo transfers (very low certainty).

1 finding from 1 review

iron‐fortified wheat flour with or without other micronutrients added vs fortified wheat flour with same micronutrients (but not iron)

Anaemia · general population of all age groups (including pregnant women) from any country, over two years of age

iron‐fortified wheat flour with or without other micronutrients added may leads to lower anaemia (defined as haemoglobin below WHO cut‐off for age and… compared with wheat flour (no added iron) with the same other micronutrients added (low certainty).

1 finding from 1 review

Wheat flour fortified with iron in combination with other micronutrients vs unfortified wheat flour (no micronutrients added)

Anaemia · general population of all age groups (including pregnant women) from any country, over two years of age

It is very uncertain whether iron‐fortified wheat flour with other micronutrients added changes anaemia (defined as haemoglobin below WHO cut‐off for age and… compared with unfortified wheat flour (no micronutrients added) (very low certainty).

1 finding from 1 review