Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

3,801 questions · 4,079 findings · 473 reviews

No studies found 669 · 16.4%GRADE not reported 852 · 20.9%Very low 738 · 18.1%Low 903 · 22.1%Moderate 716 · 17.6%High 201 · 4.9%

Rice fortified with iron alone or in combination with other micronutrients vs unfortified rice (no micronutrients added)

Any adverse effects (hookworm infection risk) · general population of all age groups (including pregnant women) from any country, over two years of age

Rice fortified with iron alone or in combination with other… may leads to higher any adverse effects (hookworm infection risk) compared with unfortified rice (no micronutrients added) (low certainty).

1 finding from 1 review

Rice fortified with iron alone or in combination with other micronutrients vs unfortified rice (no micronutrients added)

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

It is very uncertain whether rice fortified with iron alone or in combination with other… changes diarrhoea (as defined by study authors) compared with unfortified rice (no micronutrients added) (very low certainty).

1 finding from 1 review

Staple food fortified with vitamin A plus other micronutrients vs no intervention

Subclinical vitamin A deficiency (serum/plasma retinol 0.70 μmol/L or less) · general population over 2 years of age

It is very uncertain whether staple food fortified with vitamin A plus other micronutrients changes subclinical vitamin A deficiency (serum/plasma retinol 0.70 μmol/L… compared with no intervention (very low certainty).

1 finding from 1 review

Staple foods fortified with vitamin A vs same unfortified staple foods

Subclinical vitamin A deficiency (serum/plasma retinol 70 μmol/L or less) · general population over 2 years of age

It is very uncertain whether staple foods fortified with vitamin A changes subclinical vitamin A deficiency (serum/plasma retinol 70 μmol/L or… compared with same unfortified staple foods (very low certainty).

1 finding from 1 review

Staple foods fortified with vitamin A vs same unfortified staple foods

Clinical vitamin A deficiency (as defined by night blindness) · general population over 2 years of age

It is very uncertain whether staple foods fortified with vitamin A changes clinical vitamin A deficiency (defined as night blindness) compared with same unfortified staple foods (very low certainty).

1 finding from 1 review