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What do systematic reviews say?

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Evidence found and GRADE certainty

416 questions · 426 findings · 56 reviews

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No studies found 109 · 25.6%GRADE not reported 23 · 5.4%Very low 109 · 25.6%Low 106 · 24.9%Moderate 64 · 15%High 15 · 3.5%

Summary of findings: oral steroids plus antibiotic vs control plus antibiotic

OME resolution at short‐term · Children with otitis media with effusion

Summary of findings: oral steroids plus antibiotic leads to higher OME resolution at short‐term compared with control plus antibiotic (high certainty).

1 finding from 1 review

Summary of Findings Table ‐ Antithrombin concentrates vs no antithrombin concentrates

Death Analysis 1.1 · adults with acute lymphoblastic leukaemia treated with asparaginase‐based chemotherapy

It is very uncertain whether summary of Findings Table ‐ Antithrombin concentrates changes all‐cause mortality ‐ Intention‐to‐treat analysis compared with no antithrombin concentrates (very low certainty).

1 finding from 1 review

Summary of Findings Table ‐ Antithrombin concentrates vs no antithrombin concentrates

Venous thromboembolism‐related mortality ‐ Intention‐to‐treat analysis · adults with acute lymphoblastic leukaemia treated with asparaginase‐based chemotherapy

It is very uncertain whether summary of Findings Table ‐ Antithrombin concentrates changes venous thromboembolism‐related mortality ‐ Intention‐to‐treat analysis compared with no antithrombin concentrates (very low certainty).

1 finding from 1 review

Summary of Findings Table ‐ Antithrombin concentrates vs no antithrombin concentrates

Clinically relevant non‐major bleeding ‐ not reported · adults with acute lymphoblastic leukaemia treated with asparaginase‐based chemotherapy

The review found no eligible studies for this question.

1 finding from 1 review

Psychosocial interventions vs inactive control

Dropout from treatment (a count of participants not meeting study‐defined completion threshold) · survivors of sexual violence and abuse

Summary of findings table ‐ Psychosocial interventions showed no clear difference in dropout from treatment (a count of participants not meeting… compared with inactive control (low certainty).

1 finding from 1 review

Psychosocial interventions vs inactive control

Adverse events (a count of reported harms or adverse events/experiences over life of study/ · survivors of sexual violence and abuse

It is very uncertain whether summary of findings table ‐ Psychosocial interventions changes adverse events (a count of reported harms or adverse… compared with inactive control (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Maternal anaemia · pregnant women

It is very uncertain whether summary of findings table ‐ Vitamin B12 supplementation changes maternal anaemia compared with placebo/no vitamin B12 supplementation (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Maternal vitamin B12 deficiency · pregnant women

It is very uncertain whether summary of findings table ‐ Vitamin B12 supplementation changes maternal vitamin B12 deficiency compared with placebo/no vitamin B12 supplementation (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Low birthweight · pregnant women

Summary of findings table ‐ Vitamin B12 supplementation showed no clear difference in low birthweight (< 2500 g) compared with placebo/no vitamin B12 supplementation (low certainty).

1 finding from 1 review

Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Preterm birth · pregnant women

Summary of findings table ‐ Vitamin B12 supplementation showed no clear difference in preterm birth (< 37 weeks) compared with placebo/no vitamin B12 supplementation (low certainty).

1 finding from 1 review