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What do systematic reviews say?

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Evidence found and GRADE certainty

2 questions · 2 findings · 1 reviews

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No studies found 0 · 0%GRADE not reported 0 · 0%Very low 0 · 0%Low 1 · 50%Moderate 1 · 50%High 0 · 0%

Probiotics vs placebo or no treatment

Number of participants who were diagnosed with acute URTIs: at least 1 event · children, adults, and the elderly

Intention‐to‐treat analysis: probiotics may leads to lower number of participants who were diagnosed with acute URTIs: at least… compared with placebo or no treatment (low certainty).

1 finding from 1 review

Probiotics vs placebo or no treatment

Number of participants who were diagnosed with acute URTIs: at least 3 events · children, adults, and the elderly

Intention‐to‐treat analysis: probiotics probably leads to lower number of participants who were diagnosed with acute URTIs: at least… compared with placebo or no treatment (moderate certainty).

1 finding from 1 review