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Evidence found and GRADE certainty

3,454 questions · 3,562 findings · 816 reviews · Headline outcomes only

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No studies found 538 · 15.1%GRADE not reported 239 · 6.7%Very low 933 · 26.2%Low 1,041 · 29.2%Moderate 612 · 17.2%High 199 · 5.6%

HFNC vs standard oxygen therapy

Treatment failure (escalation of respiratory therapy to NIV, NIPPV or invasive ventilation) Measured up to 28 days · adults in the ICU, requiring respiratory support

HFNC may leads to lower treatment failure (escalation of respiratory therapy to NIV, NIPPV… compared with standard oxygen therapy (low certainty).

1 finding from 1 review

HFNC vs standard oxygen therapy

In‐hospital mortality (up to 90 days; included studies reported in‐hospital mortality, and mortality up to 28 days and up to ICU discharge) · adults in the ICU, requiring respiratory support

HFNC showed no clear difference in in‐hospital mortality (up to 90 days; included studies reported… compared with standard oxygen therapy (moderate certainty).

1 finding from 1 review

HFNC vs NIPPV or NIV

Treatment failure (escalation of respiratory therapy to NIV, NIPPV or invasive ventilation) Measured up to 28 days · adults in the ICU, requiring respiratory support

HFNC showed no clear difference in treatment failure (escalation of respiratory therapy to NIV, NIPPV… compared with NIPPV or NIV (low certainty).

1 finding from 1 review

HFNC vs NIPPV or NIV

In‐hospital mortality (up to 90 days; included studies reported in‐hospital mortality, and mortality up to 28 days and up to ICU discharge) · adults in the ICU, requiring respiratory support

HFNC showed no clear difference in in‐hospital mortality (up to 90 days; included studies reported… compared with NIPPV or NIV (low certainty).

1 finding from 1 review

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

Diarrhoea (three liquid stools in a single day) (only in children 2 to 11 years of age) · general population of all age groups (including pregnant women) from any country, over two years of age
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)

Diarrhoea (three liquid stools in a single day) (only in children 2 to 11 years of age) · general population of all age groups (including pregnant women) from any country, over two years of age
1 finding from 1 review