title: [Significance of idiopathic preterm birth in relation to previous and future pregnancies].
abstract: This registry-based cohort study aimed to describe the relationship between pregnancy complications in the first and second pregnancy, focussing on idiopathic and indicated preterm birth of singleton infants in either pregnancy. The cohort consisted of all women living in Denmark with a first singleton birth in 1982 and a second in the period 1982-1987 (13,967 women). The risk of a second preterm birth was not significantly different between women who had an idiopathic or an indicated first preterm birth (15.2 and 12.8% respectively). Adjustment by logistic regression analysis for other risk factors for preterm birth did not influence the relative risk (6.0 before 32 weeks and 4.8 between 32 and 36 weeks) of a second preterm birth subsequent to a first one. Women with idiopathic preterm delivery in their first or second pregnancies give birth to infants with lower birth weight in previous or subsequent pregnancies. Emergency cesarean section in a first term pregnancy was a risk factor for subsequent idiopathic preterm birth.
authors.affiliation: H:S Rigshospitalet, Juliane Marie Centret, føde- og gynaekologisk afdeling.
authors.forename: J
authors.initials: J
authors.lastname: Kristensen
authors.forename: J
authors.initials: J
authors.lastname: Langhoff-Roos
authors.forename: F B
authors.initials: FB
authors.lastname: Kristensen
mesh_terms: D002585:Cesarean Section; D015331:Cohort Studies; D003718:Denmark; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D007752:Obstetric Labor, Premature / Q000209:etiology; D011247:Pregnancy; D012008:Recurrence; D012042:Registries; D012307:Risk Factors
vernacular_title: Betydningen af idiopatisk praeterm fødsel for tidligere og efterfølgende graviditeter.