Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,310 questions · 1,358 findings · 214 reviews

No studies found 230 · 16.9%GRADE not reported 169 · 12.4%Very low 269 · 19.8%Low 277 · 20.4%Moderate 291 · 21.4%High 122 · 9%

Prebiotic vs placebo

Withdrawals due to adverse events · people with mild‐to‐moderate disease (Rachmilewitz index) or active disease (SCCAI score of 4 to 10)

It is very uncertain whether prebiotics changes withdrawals due to adverse events (14 days to 2 or 3 months) compared with placebo (very low certainty).

1 finding from 1 review

Inulin and oligofructose 15 g vs inulin and oligofructose 7.5 g daily

Clinical remission · Patients with active mild to moderate ulcerative colitis

It is very uncertain whether inulin and oligofructose 15 g changes clinical remission (9 weeks) compared with inulin and oligofructose 7.5 g daily (very low certainty).

1 finding from 1 review

Inulin and oligofructose 15 g vs inulin and oligofructose 7.5 g daily

Clinical improvement (Mayo score) (9 weeks) · Patients with active mild to moderate ulcerative colitis

It is very uncertain whether inulin and oligofructose 15 g changes clinical improvement (Mayo score) (9 weeks) compared with inulin and oligofructose 7.5 g daily (very low certainty).

1 finding from 1 review

Inulin and oligofructose 15 g vs inulin and oligofructose 7.5 g daily

Total adverse events (9 weeks) · Patients with active mild to moderate ulcerative colitis

It is very uncertain whether inulin and oligofructose 15 g changes total adverse events (9 weeks) compared with inulin and oligofructose 7.5 g daily (very low certainty).

1 finding from 1 review

Vitamin D vs placebo

Rate of exacerbations requiring systemic corticosteroids · children and adults with predominantly mild to moderate asthma

Summary of findings table ‐ Vitamin D showed no clear difference in proportion of participants with one or more exacerbations treated… compared with placebo (high certainty).

1 finding from 1 review

Vitamin D vs placebo

Patients with severe exacerbations (requiring hospitalisation or ER visit) · children and adults with predominantly mild to moderate asthma

Summary of findings table ‐ Vitamin D showed no clear difference in proportion of participants with one or more exacerbations requiring… compared with placebo (moderate certainty).

1 finding from 1 review

Vitamin D vs placebo

Proportion of participants with one or more serious adverse events due to any cause · children and adults with predominantly mild to moderate asthma

Summary of findings table ‐ Vitamin D showed no clear difference in proportion of participants with one or more serious adverse events… compared with placebo (high certainty).

1 finding from 1 review

Vitamin D vs placebo

Withdrawals (parallel group trials/first arm cross‐over trials) · children and adults with predominantly mild to moderate asthma

Summary of findings table ‐ Vitamin D showed no clear difference in withdrawals from trial compared with placebo (high certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

All‐cause mortality at up to day 28 ‐ total · individuals with moderate to severe disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in all‐cause mortality at up to day 28 ‐ total compared with placebo or standard care alone (high certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs human immunoglobulin

All‐cause mortality at up to day 28 · individuals with moderate to severe disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in all‐cause mortality at up to day 28 compared with human immunoglobulin (low certainty).

1 finding from 1 review