Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,703 questions · 15,007 findings · 1,416 reviews

No studies found 2,881 · 19.2%GRADE not reported 1,551 · 10.3%Very low 3,111 · 20.7%Low 3,881 · 25.9%Moderate 2,669 · 17.8%High 914 · 6.1%

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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

L‐arginine vs placebo

Frequency of hospitalization (number of days in hospital) · sickle cell disease

It is very uncertain whether L‐arginine changes frequency of hospitalization (number of days in hospital) compared with placebo (very low certainty).

1 finding from 1 review

Omega‐3 vs placebo

Adverse effects (any adverse effect) · sickle cell disease

It is very uncertain whether omega‐3 changes adverse effects (any adverse effect) compared with placebo (very low certainty).

1 finding from 1 review