Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

2,973 questions · 3,072 findings · 410 reviews · Headline outcomes only

No studies found 559 · 18.2%GRADE not reported 143 · 4.7%Very low 654 · 21.3%Low 833 · 27.1%Moderate 683 · 22.2%High 200 · 6.5%

Intervention not reported

Anaemia Defined as haemoglobin (Hb) concentration < 11 g/dL Measured at after 6 months and 6 ‐ 12 months of intervention · General population

The intervention may leads to lower anaemia Defined as haemoglobin (Hb) concentration < 11 g/dL Measured… (low certainty).

1 finding from 1 review

Intervention not reported

Anaemia Anaemia was defined as a haemoglobin (Hb) concentration < 13 g/dL for boys and < 12 g/dL for girls Measured after 9 months of intervention · General population

It is very uncertain whether the intervention changes anaemia Anaemia was defined as a haemoglobin (Hb) concentration < 13… (very low certainty).

1 finding from 1 review