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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Methylphenidate vs placebo or no intervention

Adverse events considered non‐serious (penicillin versus doxycycline) · Children and adolescents with ADHD

It is very uncertain whether methylphenidate changes proportion of participants with one or more adverse events… compared with placebo or no intervention (very low certainty).

1 finding from 1 review

Methylphenidate vs placebo or no intervention

General behaviour: all parallel‐group trials and first‐period cross‐over trials General behaviour rating scales (Teacher‐rated) · Children and adolescents with ADHD

It is very uncertain whether methylphenidate changes general behaviour: all parallel‐group trials and first‐period… compared with placebo or no intervention (very low certainty).

1 finding from 1 review

Zinc vs placebo

BMD Z score (total hip/femoral neck) · children and adults with β‐thalassaemia major and low bone mass

Summary of findings – zinc probably leads to higher BMD Z score (total hip/femoral neck) compared with placebo (moderate certainty).

1 finding from 1 review

Zinc vs placebo

BMD Z score (lumbar spine) · children and adults with β‐thalassaemia major and low bone mass

Summary of findings – zinc probably leads to higher BMD Z score (lumbar spine) compared with placebo (moderate certainty).

1 finding from 1 review