Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,315 questions · 23,557 findings · 2,311 reviews

No studies found 4,183 · 17.8%GRADE not reported 3,930 · 16.7%Very low 5,371 · 22.8%Low 5,787 · 24.6%Moderate 3,320 · 14.1%High 966 · 4.1%

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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

Low vs high 17ß‐oestradiol dose

Uterine volume (cm³) · young women with Turner syndrome who have completed pubertal induction
2 findings from 1 review

Heparin vs normal saline solution locking

Occlusion of CVC (combining participant and catheter as unit of analysis) Blood withdrawing · adults with CVCs

Heparin may leads to lower occlusion of CVC (combining participant, and catheter as unit of… compared with normal saline solution locking (low certainty).

1 finding from 1 review

Heparin vs normal saline solution locking

CVC‐related bloodstream infections (positive microbiological culture, participant as unit of analysis) · adults with CVCs

It is very uncertain whether heparin changes CVC‐related bloodstream infections (positive microbiological… compared with normal saline solution locking (very low certainty).

1 finding from 1 review