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Evidence found and GRADE certainty

4,721 questions · 19,640 findings · 2,039 reviews · Headline outcomes only

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No studies found 3,754 · 19.1%GRADE not reported 1,273 · 6.5%Very low 4,859 · 24.7%Low 5,568 · 28.4%Moderate 3,240 · 16.5%High 946 · 4.8%

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Recombinant zoster vaccine vs placebo

Participants with adverse events ‐ potential immune‐mediated disease Clinical or laboratory criteria · healthy older adults aged ≥ 60 years

Recombinant zoster vaccine showed no clear difference in participants with adverse events ‐ potential immune‐mediated… compared with placebo (moderate certainty).

1 finding from 1 review

Recombinant zoster vaccine vs placebo

Participants with adverse events ‐ any local symptom Clinical criteria · healthy older adults aged ≥ 60 years

Recombinant zoster vaccine probably leads to higher participants with adverse events ‐ any local symptomClinical criteria compared with placebo (moderate certainty).

1 finding from 1 review

Recombinant zoster vaccine vs placebo

Dropouts ‐ did not receive second dose Clinical or laboratory criteria · healthy older adults aged ≥ 60 years

Recombinant zoster vaccine probably leads to higher dropouts ‐ did not receive second doseClinical or laboratory criteria compared with placebo (moderate certainty).

1 finding from 1 review

Live zoster vaccine vs placebo

Participants with adverse events Clinical or laboratory criteria · healthy older adults aged ≥ 60 years

Live zoster vaccine probably leads to higher participants with adverse eventsClinical or laboratory criteria compared with placebo (moderate certainty).

1 finding from 1 review

Live zoster vaccine vs placebo

Participants with adverse events: 1 or more serious adverse events regardless of type of storage of the vaccine Clinical or laboratory criteria · healthy older adults aged ≥ 60 years

Live zoster vaccine showed no clear difference in participants with adverse events: 1 or more serious adverse events… compared with placebo (moderate certainty).

1 finding from 1 review

Live zoster vaccine vs placebo

Systemic adverse events at · healthy older adults aged ≥ 60 years

Live zoster vaccine showed no clear difference in participants with adverse events ‐ systemic adverse eventsClinical… compared with placebo (moderate certainty).

1 finding from 1 review

Live zoster vaccine vs placebo

Participants with adverse events ‐ injection site adverse events Clinical criteria · healthy older adults aged ≥ 60 years

Live zoster vaccine probably leads to higher participants with adverse events ‐ injection site adverse… compared with placebo (moderate certainty).

1 finding from 1 review

Live zoster vaccine vs placebo

Dropouts Clinical or laboratory criteria · healthy older adults aged ≥ 60 years

Live zoster vaccine showed no clear difference in dropoutsClinical or laboratory criteria compared with placebo (moderate certainty).

1 finding from 1 review

Recombinant zoster vaccine vs placebo

Cumulative incidence of herpes zoster at least 3.2 years · healthy older adults aged ≥ 60 years

Recombinant zoster vaccine probably leads to lower cumulative incidence of herpes zoster at least 3.2 years compared with placebo (moderate certainty).

1 finding from 1 review

Recombinant zoster vaccine vs placebo

Participants with adverse events ‐ death Clinical criteria · healthy older adults aged ≥ 60 years

Recombinant zoster vaccine showed no clear difference in participants with adverse events ‐ deathClinical criteria compared with placebo (moderate certainty).

1 finding from 1 review

Zinc vs no zinc supplementation

Mortality due to all‐cause diarrhea · otherwise healthy children aged 6 months to 12 years of age

Zinc supplementation showed no clear difference in mortality due to all‐cause diarrhea compared with no zinc supplementation (moderate certainty).

1 finding from 1 review

Condiments/seasonings fortified with iron vs unfortified condiments/seasonings

Anaemia · population aged 2 years and above (Ballot 1989a (C) ‐ > 10 years, Chen 2005 (C) ‐ >3 years; Huo 2002 ‐ 11‐17 years, Longfils 2008‐ 6‐21…

It is very uncertain whether condiments/seasonings fortified with iron changes anaemia (defined as haemoglobin below WHO cut‐off for age and… compared with unfortified condiments/seasonings (very low certainty).

1 finding from 1 review