Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,756 questions · 13,493 findings · 1,305 reviews · Headline outcomes only

No studies found 2,594 · 19.2%GRADE not reported 728 · 5.4%Very low 2,868 · 21.3%Low 3,777 · 28%Moderate 2,620 · 19.4%High 906 · 6.7%

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Zinc vs placebo

QoL of participants living with SCD and their caregivers · people with sickle cell disease

The review found no eligible studies for this question.

1 finding from 1 review

Zinc vs placebo

Frequency of sickle cell‐related complications: number of participants with completely healed leg ulcer ( · people with sickle cell disease

It is very uncertain whether zinc changes frequency of sickle cell‐related complications: number of… compared with placebo (very low certainty).

1 finding from 1 review

N‐acetylcysteine (1200 mg) vs placebo

QoL of participants living with SCD and their caregivers · sickle cell disease

It is very uncertain whether N‐acetylcysteine (1200 mg) changes qoL of participants living with SCD and their caregivers (measured… compared with placebo (very low certainty).

1 finding from 1 review

Vitamin C 1400 mg plus vitamin E 800 mg vs placebo

Severity of pain (use of opioid analgesics) · adults with sickle cell disease (adults with homozygous SCA or sickle beta 0 thalassaemia SCD)

It is very uncertain whether vitamin C 1400 mg plus vitamin E 800 mg changes severity of pain (use of opioid analgesics) compared with placebo (very low certainty).

1 finding from 1 review

L‐arginine vs placebo

Pain 0 to 100 visual analogue scale and 10‐point Likert scale (lower score = less pain) · sickle cell disease

L‐arginine showed no clear difference in severity of pain (assessed using a 10‐cm visual analogue scale from… compared with placebo (low certainty).

1 finding from 1 review