Preterm birth · pregnant women
Summary of findings: lipid‐based nutrient supplements (LNS) showed no clear difference in preterm births (births before 37 weeks of gestation) compared with iron folic acid (IFA) (moderate certainty).
1 finding from 1 review
Community and primary care based maternal oral health interventions vs Usual antenatal care or no structured oral health intervention
Preterm birth (<37 weeks) · Pregnant women and postpartum mothers
Maternal oral health interventions may reduce preterm birth, but the pooled RCT estimate was not statistically significant (low certainty).
1 finding from 1 review
RR 0.80 [0.60, 1.05]
2 studies
Low
Preterm birth · childbearing women and their infants (all) (important/secondary outcomes)
Summary of findings table ‐ Midwife continuity of care models showed no clear difference in preterm birth (< 37 weeks) compared with other models of care (low certainty).
1 finding from 1 review
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 (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
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
Preterm birth · pregnant women with a history of one or more UTI before or during pregnancy
It is very uncertain whether nitrofurantoin and close surveillance changes preterm birth (< 37 weeks) compared with close surveillance alone (very low certainty).
1 finding from 1 review
Intervention not reported
Early preterm birth < 34 weeks · pregnant women and their babies
The intervention leads to lower early preterm birth < 34 weeks (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
Gestational age (preterm birth < 37 weeks) · Pregnant women in unselected or low‐risk populations.
All routine Doppler ultrasound showed no clear difference in preterm birth (before 37 weeks) compared with no Doppler ultrasound (high certainty).
1 finding from 1 review
Preterm birth · Pregnant women with hyperemesis gravidarum
Acupuncture showed no clear difference in preterm birth less than 37 weeks compared with placebo (low certainty).
1 finding from 1 review
Intervention not reported
Preterm birth (< 37 weeks' gestation) · All pregnant women receiving either vitamin C supplementation or control either in areas where there is inadequate dietary intake or where…
The intervention showed no clear difference in preterm birth (< 37 weeks' gestation) (high certainty).
1 finding from 1 review
Gestational age (preterm birth < 37 weeks) · healthy pregnant women receiving calcium supplementation vs placebo or no treatment
Calcium supplementation showed no clear difference in preterm birth (a) Birth prior to 37 weeks compared with placebo or no treatment (maternal outcomes) (moderate certainty).
1 finding from 1 review
Preterm birth less than 34 weeks' gestation · healthy pregnant women receiving calcium supplementation vs placebo or no treatment
Calcium supplementation showed no clear difference in preterm birth (b) Birth prior to 34 weeks compared with placebo or no treatment (maternal outcomes) (moderate 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
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 · pregnant women receiving vitamin E supplementation or control, living in areas where there is either inadequate dietary intake of vitamin…
Any vitamin E supplementation showed no clear difference in preterm birth (less than 37 weeks' gestation) compared with placebo, no placebo or other supplements (high 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