Preterm birth less than 28 weeks · Women with a multiple pregnancy
Intramuscular (IM) progesterone showed no clear difference in preterm birth less than 28 weeks compared with no treatment or placebo (moderate certainty).
1 finding from 1 review
Preterm birth · Women with a multiple pregnancy
Intramuscular (IM) progesterone showed no clear difference in preterm birth less than 37 weeks compared with no treatment or placebo (high certainty).
1 finding from 1 review
Preterm birth less than 34 weeks' gestation · Women with a multiple pregnancy
Vaginal progesterone showed no clear difference in preterm birth less than 34 weeks compared with no treatment or placebo (low certainty).
1 finding from 1 review
Gestational age (preterm birth < 37 weeks) · pregnant women
Pregnant women with dental caries did not have a significantly increased risk of preterm birth (pooled OR 1.16, 95% CI 0.90 to 1.49; 5 studies; I2=35%); certainty of evidence not graded.
1 finding from 1 review
Preterm birth · women with a twin pregnancy
Oral betamimetic showed no clear difference in preterm birth (less than 37 weeks' gestation) compared with placebo (low certainty).
1 finding from 1 review
Preterm birth less than 34 weeks' gestation
It is very uncertain whether cervical cerclage in combination with antibiotics and tocolytics changes preterm birth < 34 completed weeks of pregnancy compared with cervical cerclage alone (very low certainty).
1 finding from 1 review
Preterm birth less than 34 weeks' gestation · women with a twin pregnancy
Oral betamimetic showed no clear difference in very preterm birth (less than 34 weeks' gestation) compared with placebo (low certainty).
1 finding from 1 review
Preterm birth stratified by clinical type (spontaneous vs iatrogenic vs term) · pregnant women
The planned subanalysis by type of preterm birth (spontaneous vs iatrogenic vs term) could not be performed because of the small number of cases and lack of information in the original studies.
1 finding from 1 review
Dental caries and preterm birth: a systematic review and meta-analysis. 2018 All outcomesPregnant women assessed around delivery in observational studies across multiple countries (Mexico, Malawi, India, France, Jordan, Finland, Tanzania); mostly retrospective cohort and case-control designs · By type of PTB (spontaneous vs iatrogenic)
no estimate extracted
0 studies
GRADE not reported
Preterm birth stratified by gestational age at birth (moderate-to-late 32 to <37, very 28 to <32, extremely <28 weeks) · pregnant women
The planned subanalysis of preterm birth by gestational age at birth (moderate-to-late, very, extremely preterm) could not be performed because of the small number of cases and lack of stratified data in the original studies.
1 finding from 1 review
Dental caries and preterm birth: a systematic review and meta-analysis. 2018 All outcomesPregnant women assessed around delivery in observational studies across multiple countries (Mexico, Malawi, India, France, Jordan, Finland, Tanzania); mostly retrospective cohort and case-control designs · By gestational age at birth
no estimate extracted
0 studies
GRADE not reported
Intervention not reported
Preterm birth < 34 weeks · women carrying twins, asymptomatic for PTL or PPROM
It is very uncertain whether the intervention changes preterm birth < 34 weeks (very low certainty).
1 finding from 1 review
Intervention not reported
Preterm birth < 37 weeks · singleton pregnancy with symptoms of PTL
It is very uncertain whether the intervention changes preterm birth < 37 weeks (very low certainty).
1 finding from 1 review
Preterm birth < 35 weeks · Pregnant women considered to have periodontal disease (gingivitis or periodontitis) after dental examination
It is very uncertain whether periodontal treatment (scaling and root planing, polishing, or… changes preterm birth < 35 weeks compared with no treatment (very low certainty).
1 finding from 1 review
Preterm birth < 32 weeks · Pregnant women considered to have periodontal disease (gingivitis or periodontitis) after dental examination
It is very uncertain whether periodontal treatment (scaling and root planing, polishing, or… changes preterm birth < 32 weeks compared with no treatment (very low certainty).
1 finding from 1 review
Preterm birth < 35 weeks · Pregnant women considered to have periodontal disease (gingivitis or periodontitis) after dental examination
1 finding from 1 review
Periodontal disease vs No periodontal disease
Preterm birth · People in observational studies
Periodontal disease and Preterm birth: pooled OR 1.58 (1.38–1.81); credibility class Ⅲ.
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 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 · 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