Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,710 questions · 14,842 findings · 1,394 reviews

No studies found 2,880 · 19.4%GRADE not reported 1,413 · 9.5%Very low 3,103 · 20.9%Low 3,870 · 26.1%Moderate 2,663 · 17.9%High 913 · 6.2%

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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

Probiotics vs placebo or no treatment

Incidence of acute URTIs during the study period (the number of acute URTIs over a period of time) · children, adults, and the elderly

Intention‐to‐treat analysis: probiotics may leads to lower incidence rate of acute URTIs compared with placebo or no treatment (low certainty).

1 finding from 1 review

Probiotics vs placebo or no treatment

Number of participants who were absent from childcare centre, school, or work due to acute URTIs · children, adults, and the elderly

It is very uncertain whether intention‐to‐treat analysis: probiotics changes number of participants who were absent from childcare centre,… compared with placebo or no treatment (very low certainty).

1 finding from 1 review

Probiotics vs placebo or no treatment

Number of participants who used prescribed antibiotics for acute URTIs · children, adults, and the elderly

Intention‐to‐treat analysis: probiotics probably leads to lower number of participants who used prescribed antibiotics for acute URTIs compared with placebo or no treatment (moderate certainty).

1 finding from 1 review

Botulinum toxin vs placebo

Participant‐reported improvement in sialorrhea in the short term · sialorrhea (excessive saliva) in people with motor neuron disease/amyotrophic lateral sclerosis

Botulinum toxin injection showed no clear difference in participant‐reported improvement in sialorrhea in the short term… compared with placebo (low certainty).

1 finding from 1 review