Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

3,801 questions · 4,079 findings · 473 reviews

No studies found 669 · 16.4%GRADE not reported 852 · 20.9%Very low 738 · 18.1%Low 903 · 22.1%Moderate 716 · 17.6%High 201 · 4.9%

Intervention not reported

Smoking cessation at ≥ 6 months · tobacco smokers (general population, low income, inpatients and outpatients with mixed diagnoses)

The intervention showed no clear difference in smoking cessation at ≥ 6 months (low certainty).

1 finding from 1 review

Motivational interviewing vs another smoking cessation intervention

Smoking cessation · tobacco smokers (general population, adolescents, offenders, homeless, substance users, hospital inpatients, HIV‐positive)

Motivational interviewing showed no clear difference in smoking cessation at ≥ 6 months compared with another smoking cessation intervention (low certainty).

1 finding from 1 review

Ovarian stimulating drugs in subfertile women vs subfertile women not treated or versus general population

Risk of invasive ovarian cancer in subfertile women exposed to ovarian stimulating drug vs unexposed women (summary of cohort studies suggesting increased risk) · subfertile women
2 findings from 1 review

Ovarian stimulating drugs in subfertile women vs subfertile women not treated or versus general population

Risk of borderline ovarian cancer in subfertile women exposed to ovarian stimulating drugs vs unexposed women (summary of case‐control studies suggesting an increase) · subfertile women
2 findings from 1 review

Rice fortified with iron alone or in combination with other micronutrients vs unfortified rice (no micronutrients added)

Anaemia · general population of all age groups (including pregnant women) from any country, over two years of age

Rice fortified with iron alone or in combination with other… may leads to lower anaemia (defined as haemoglobin below the WHO cut‐off, adjusted for… compared with unfortified rice (no micronutrients added) (low certainty).

1 finding from 1 review

Rice fortified with iron alone or in combination with other micronutrients vs unfortified rice (no micronutrients added)

Iron deficiency (as defined by study authors, based on a biomarker of iron status) · general population of all age groups (including pregnant women) from any country, over two years of age

Rice fortified with iron alone or in combination with other… may leads to lower iron deficiency (as defined by study authors, based on a biomarker… compared with unfortified rice (no micronutrients added) (low certainty).

1 finding from 1 review

Rice fortified with iron alone or in combination with other micronutrients vs unfortified rice (no micronutrients added)

Vitamin A deficiency · general population of all age groups (including pregnant women) from any country, over two years of age

Rice fortified with iron alone or in combination with other… showed no clear difference in vitamin A deficiency (as defined by the study authors) compared with unfortified rice (no micronutrients added) (low certainty).

1 finding from 1 review