Preterm birth · pregnant women
Summary of findings table ‐ Vitamin B12 supplementation showed no clear difference in preterm birth (< 37 weeks) compared with placebo/no vitamin B12 supplementation (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 (healthy and probable zinc deficiency)
Zinc supplementation showed no clear difference in preterm birth (< 37 weeks) compared with no zinc (with or without placebo) (low certainty).
1 finding from 1 review
Gestational age (preterm birth < 37 weeks) · pregnant women in second trimester of pregnancy
Antihelminthics showed no clear difference in preterm birth (birth before 37 weeks of gestation) compared with control (low certainty).
1 finding from 1 review
Preterm birth less than 34 weeks' gestation · pregnant women with chronic or gestational hypertension
Setting of BP measurement: self‐measurement showed no clear difference in preterm birth (birth before 34 completed weeks' gestation) compared with conventional clinic measurement (low 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, 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 undergoing assisted reproduction
It is very uncertain whether GM‐CSF‐supplemented culture media changes preterm birth compared with culture media not supplemented with GM‐CSF (very low 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 recurrent miscarriage of unclear etiology
It is very uncertain whether progestogen changes preterm birth compared with placebo/no treatment (very low certainty).
1 finding from 1 review
Intervention not reported
Preterm birth (before 37 weeks' gestation) · pregnant women considered to be at risk of developing pre‐eclampsia
The intervention leads to lower preterm birth (before 37 weeks' gestation) (high certainty).
1 finding from 1 review
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
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 · pregnant women and their infants..
Vitamin D + calcium supplementation may leads to higher preterm birth (less than 37 weeks' gestation) compared with placebo or no intervention (low certainty).
1 finding from 1 review
Preterm birth · pregnant women and their infants..
Vitamin D + calcium + other vitamins and minerals showed no clear difference in preterm birth (less than 37 weeks' gestation) compared with calcium + other vitamins and minerals (but no vitamin D) (low certainty).
1 finding from 1 review
Preterm birth · pregnant women and their infants..
Vitamin D supplementation showed no clear difference in preterm birth (less than 37 weeks' gestation) compared with placebo or no intervention (low certainty).
1 finding from 1 review
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 with mild to moderate hypertension during pregnancy
Any antihypertensive drug showed no clear difference in preterm birth (< 37 weeks) compared with no antihypertensive drugs/placebo (moderate certainty).
1 finding from 1 review