Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

84 questions · 87 findings · 15 reviews · Headline outcomes only

No studies found 20 · 23%GRADE not reported 3 · 3.4%Very low 27 · 31%Low 17 · 19.5%Moderate 16 · 18.4%High 4 · 4.6%

Combined oral and intravenous vs oral or intravenous alone

Wound infection · colorectal surgery

Combined oral and intravenous leads to lower surgical wound infection: oral + iv versus iv alone compared with oral or intravenous alone (high certainty).

2 findings from 1 review

Intravenous iron with oral iron vs oral iron

Persistent anaemia symptoms Reported by the women · women with postpartum iron deficiency anaemia

It is very uncertain whether intravenous iron with oral iron changes persistent anaemia symptoms ‐ 1 week Visual Analogue Scale ≥ 7 compared with oral iron (Comparison 6) (very low certainty).

3 findings from 1 review