Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

26 questions · 26 findings · 4 reviews · Headline outcomes only

No studies found 15 · 57.7%GRADE not reported 1 · 3.8%Very low 5 · 19.2%Low 1 · 3.8%Moderate 4 · 15.4%High 0 · 0%

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

Zinc vs placebo

Pulmonary exacerbations number of participants requiring IV antibiotics · children with cystic fibrosis

Summary of findings: Zinc supplementation showed no clear difference in pulmonary exacerbations number of participants requiring IV… compared with placebo (moderate certainty).

1 finding from 1 review

Zinc vs placebo

Adverse events number of participants hospitalised during the trial · children with cystic fibrosis

Summary of findings: Zinc supplementation showed no clear difference in adverse events number of participants hospitalised during the trial compared with placebo (moderate certainty).

1 finding from 1 review

Zinc vs placebo

Need for antibiotics days of antibiotic use · children with cystic fibrosis

It is very uncertain whether summary of findings: Zinc supplementation changes need for antibiotics number of days on IV or oral antibiotics compared with placebo (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Protein, arginine, zinc and antioxidants vs standard diet or placebo

The proportion of pressure ulcers healed · residents of long‐term care (≥ 65 years) with pressure ulcers; inpatients with pressure ulcers

It is very uncertain whether summary of findings table ‐ Protein, arginine, zinc and antioxidants changes pressure ulcers healed compared with standard diet or placebo (very low certainty).

1 finding from 1 review