Intervention not reported
Pregnancy with serious adverse outcome (composite including maternal death, baby death, pre‐eclampsia, small‐for‐gestational age, preterm birth) ‐ only trials with individual participant data · pregnant women considered to be at risk of developing pre‐eclampsia
The intervention leads to lower pregnancy with serious adverse outcome (composite including maternal… (high certainty).
1 finding from 1 review
Gestational age (preterm birth < 37 weeks) · Pregnant women who smoke
Outcomes for all interventions for smoking cessation in pregnancy showed no clear difference in preterm birth (under 37 weeks) compared with control: subgrouped by main intervention strategy (comparison 20) (high certainty).
1 finding from 1 review
Preterm birth · pregnant women with diastolic hypertension
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Preterm birth · pregnant women
Nutritional education may leads to lower preterm birth compared with no counselling or education during pregnancy (low certainty).
1 finding from 1 review
Preterm birth · pregnant women
It is very uncertain whether respiratory syncytial virus vaccine changes preterm birth compared with placebo (very low certainty).
1 finding from 1 review
Preterm birth · pregnant women, or those within 42 days of delivery
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Preterm birth · women during pregnancy
A dose of vitamin D 601 IU or higher showed no clear difference in preterm birth compared with 600 IU or lower alone or with other nutrients (low certainty).
1 finding from 1 review
Preterm birth · women during pregnancy
A dose of vitamin D 4000 IU/d or more showed no clear difference in preterm birth compared with 3999 IU/d or less alone or with any other nutrient (low certainty).
1 finding from 1 review
Intervention not reported
Preterm birth · pregnant women
The intervention may leads to lower preterm birth (low certainty).
1 finding from 1 review
Preterm birth · women during the preconception, pregnancy and postpartum period
Any supplement containing iodine showed no clear difference in preterm birth compared with same supplement without iodine or no treatment/placebo (maternal… (low certainty).
1 finding from 1 review
Preterm birth · Pregnant women at low risk of complications
Reduced number of antenatal care visits/goal‐oriented showed no clear difference in preterm birth compared with standard antenatal care visits (moderate certainty).
1 finding from 1 review
Preterm birth · Pregnant women recruited before 20 weeks' gestation
Caffeinated (experimental group) showed no clear difference in preterm birth compared with decaffeinated group (control group) (low certainty).
1 finding from 1 review
Preterm birth · pregnant women
All diet and/or exercise interventions showed no clear difference in preterm birth compared with standard/other care (moderate certainty).
1 finding from 1 review
Intervention not reported
Preterm birth · Pregnant women
The intervention showed no clear difference in preterm birth (low certainty).
1 finding from 1 review
Preterm birth · pregnant women
Vitamin A alone showed no clear difference in preterm birth compared with placebo or no treatment (high certainty).
1 finding from 1 review
Preterm birth · women during pregnancy
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Preterm birth · women during pregnancy
Universal screening showed no clear difference in preterm birth compared with case finding (high certainty).
1 finding from 1 review
Preterm birth · women during pregnancy
Multiple micronutrients showed no clear difference in preterm births compared with control (iron with or without folic acid) (moderate certainty).
1 finding from 1 review
Preterm birth · patients with asymptomatic bacteriuria during pregnancy
Antibiotics may leads to lower preterm birth < 37 weeks compared with no treatment (low certainty).
1 finding from 1 review
Preterm birth · women with singleton pregnancies and threatened preterm labor (PTL) between 23 to 35 weeks
Main comparison (FFN knowledge showed no clear difference in preterm birth < 37 weeks compared with no knowledge) (low certainty).
1 finding from 1 review