Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

880 questions · 912 findings · 126 reviews · Headline outcomes only

No studies found 143 · 15.7%GRADE not reported 38 · 4.2%Very low 250 · 27.4%Low 253 · 27.7%Moderate 168 · 18.4%High 60 · 6.6%

Interventions delivered by dental professionals vs control

Smoking cessation · participants who used tobacco products

It is very uncertain whether interventions delivered by dental professionals changes single session behavioural support versus usual care, brief advice,… compared with control (very low certainty).

1 finding from 1 review

Wheat flour fortified with iron in combination with other micronutrients vs unfortified wheat flour (no micronutrients added)

Diarrhoea (three liquid stools in a single day) (only in children 2 to 11 years of age) · general population of all age groups (including pregnant women) from any country, over two years of age
1 finding from 1 review

iron‐fortified wheat flour with or without other micronutrients added vs fortified wheat flour with same micronutrients (but not iron)

Diarrhoea (three liquid stools in a single day) (only in children 2 to 11 years of age) · general population of all age groups (including pregnant women) from any country, over two years of age
1 finding from 1 review

Intervention not reported

Cost of analgesic regimens for single‐injection blocks · patients with hip fracture
1 finding from 1 review

Intervention not reported

Failure to close a patent ductus arteriosus (PDA) (after single or 3 doses) · preterm infants with patent ductus arteriosus

The intervention showed no clear difference in failure to close a patent ductus arteriosus (PDA) (after single or 3… (moderate certainty).

1 finding from 1 review

Intervention not reported

Bayley‐II MDI at 18 to 24 months Bayley Scales of Infant Development, Second Edition, yields 2 single age‐standardised composite scores (range 50 to 150): a Mental Development Index (MDI), which measures cognition through sensory perception, knowl... · preterm infants with low birth weight
1 finding from 1 review

Intervention not reported

Multifocal vs single vision lens spectacles · children with myopia (nearsightedness)
1 finding from 1 review

Intervention not reported

Peripheral plus spectacles vs single vision lens spectacles · children with myopia (nearsightedness)
1 finding from 1 review

Intervention not reported

Bifocal vs single vision soft contact lenses · children with myopia (nearsightedness)
1 finding from 1 review

Intervention not reported

Orthokeratology contact lenses vs single vision lenses · children with myopia (nearsightedness)

The review found no eligible studies for this question.

1 finding from 1 review

Intervention not reported

Spherical aberration soft contact lenses vs single vision soft contact lenses · children with myopia (nearsightedness)
1 finding from 1 review

Equivalent schedules of intradermal fractional‐dose inactivated poliovirus vaccine vs intramuscular inactivated poliovirus vaccine

Seroconversion rate (after a single primary dose) · children

Equivalent schedules of intradermal fractional‐dose inactivated… may leads to lower seroconversion rate (after a single primary dose) compared with intramuscular inactivated poliovirus vaccine (low certainty).

1 finding from 1 review

Interventions for involving older patients with multi‐morbidity in decision‐making about their health care vs usual care

Participants' evaluation of the intervention · older patients with multi‐morbidity

Interventions for involving older patients with multi‐morbidity in… probably leads to higher patient evaluation of care/the intervention Care related to patient… compared with usual care (moderate certainty).

1 finding from 1 review