title: [Idiopathic preterm deliveries in Denmark].
abstract: The objective of the study was to characterize and quantify various demographic factors in idiopathic preterm delivery. All women with a permanent address in Denmark with singleton pregnancies who gave birth to an infant in 1982 (n = 51,851) are included. The material was obtained by a linkage of the Medical Birth Register and the National Register of Hospital Discharges, using the personal identification number. The incidence of singleton preterm delivery was 4.5% (n = 2330) of which 67% (n = 1557) were idiopathic. Neonatal mortality rates were significantly lower in idiopathic compared to indicated preterm birth. Following stepwise logistic regression analysis, maternal age below 20 (adjusted odds ratio 1.63, 95% confidence interval (CI) 1.07-2.47; p < 0.03), maternal age above 30 (adjusted odds ratio 0.74, 95% CI 0.60-0.90; p < 0.004) and being married (adjusted odds ratio 0.63, 95% CI 0.43-0.94; p < 0.03) correlated with idiopathic preterm birth. It is concluded that idiopathic preterm birth is more common in single, young women and associated with lower neonatal mortality rate than indicated preterm birth.
authors.affiliation: Rigshospitalet, København, 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: D000328:Adult; D015331:Cohort Studies; D003718:Denmark / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D007231:Infant, Newborn; D008423:Maternal Age; D007752:Obstetric Labor, Premature / Q000453:epidemiology*; D011247:Pregnancy; D012042:Registries