Risk of preterm birth in relation to history of preterm birth: a population‐based registry study of 213 335 women in Norway

Abstract

Objective To assess the association between preterm first birth and preterm second birth according to gestational age and to determine the role of placental disorder in recurrent preterm birth.Design Population-based registry study.Setting Medical Birth Registry of Norway and Statistics Norway.Population Women (n = 213 335) who gave birth to their first and second singleton child during 1999-2014 (total n = 426 670 births).Methods Multivariate logistic regression analyses, adjusted for placental disorders, maternal, obstetric and socio-economic factors.Main outcome measures Extremely preterm (<28 +0 weeks), very preterm (28 +0 -33 +6 weeks) and late preterm (34 +0 -36 +6 weeks) second birth.Results Preterm birth (<37 weeks) rates were 5.6% for first births and 3.7% for second births. Extremely preterm second births (0.2%) occurred most frequently among women with an extremely preterm first birth (aOR 12.90, 95% CI 7.47-22.29).Very preterm second births (0.7%) occurred most frequently after an extremely preterm birth (aOR 12.98,. Late preterm second births (2.8%) occurred most frequently after a previous very preterm birth (aOR 6.86,. Placental disorders contributed 30-40% of recurrent extremely and very preterm births and 10-20% of recurrent late preterm birth.Conclusion A previous preterm first birth was a major risk factor for a preterm second birth. The contribution of placental disorders was more pronounced for recurrent extremely and very preterm birth than for recurrent late preterm birth. Among women with any category of preterm first birth, more than one in six also had a preterm second birth (17.4%).

Preterm Delivery: Associated Risk Factors And Neonatal Outcomes in Duhok Hospital for Obstetrics And Gynecology

“…History of a previous premature birth was one of the main risk factors for PTD. This finding is confirmed by previous studies (Sureshbabu et al, 2021) (Tingleff et al, 2022). Prelabour (premature) rupture of membranes (PROM) is a crucial risk factor for PTD and is responsible for about 30 percent of all preterm deliveries (Weissmann-Brenner et al, 2009).…”

Association of Preterm Singleton Birth With Fertility Treatment in the US

“…Studies have found that women with previous preterm deliveries had a higher risk of preterm birth in their next pregnancy. 20,24 However, in the stratified analyses, we observed no fertility treatment-associated increase in the risk of preterm birth among women with a history of preterm delivery. One explanation might be that women undergoing fertility treatment who have a history of preterm delivery might pay more attention to perinatal care, which could reduce the risk of preterm birth.…”

Evaluation of the effects of COVID‐19 disease and the trimester in which the disease is diagnosed on obstetric and neonatal outcomes: A retrospective cohort study

“…6 Births between 34 and 37 weeks are called late preterm births. 7,8 This distinction is made at 34 weeks, when the health prognosis is significantly better than at earlier weeks. 8 In this study, the rate of preterm delivery of pregnant women with and without COVID-19 was compared based on 34 and 37 weeks of gestation.…”

“…7,8 This distinction is made at 34 weeks, when the health prognosis is significantly better than at earlier weeks. 8 In this study, the rate of preterm delivery of pregnant women with and without COVID-19 was compared based on 34 and 37 weeks of gestation. Premature birth rates determined according to 34 and 37 weeks of gestation were additionally compared between groups determined according to the trimester in which COVID-19 passed.…”