title: Estonian medical birth registry 1992-1994: association of risk factors with perinatal mortality.
abstract: OBJECTIVE
  To investigate the association of different maternal sociodemographic characteristics and infant sex with perinatal mortality among primiparas and multiparas.
  
  
  METHODS
  Analysis of routine data from the Estonian Medical Birth Registry covering the whole of Estonia. A total of 47 358 infants (including stillborns) with a birth weight 1000 g or more from 1992 through 1994 were studied. Perinatal mortality rate, crude odds ratio (OR) and adjusted OR (calculated by a logistic regression model) were used to evaluate the association. OR values were adjusted for maternal age at delivery, maternal ethnicity, educational level, residence, marital status, smoking status, history of previous abortion and infant sex.
  
  
  RESULTS
  The perinatal mortality rate was 12.2 per 1000 total births among primiparous and 14.3 among multiparous women. The highest adjusted ORs of perinatal deaths were found in older (35 years and over) primiparas (1.78; 95% confidence interval (CI 0.88-3.57)) and multiparas (1.81; 95% CI 1.29-2.55), in unmarried (single) primiparas (1.59; 95% CI 1.14-2.20) and multiparas (1.98; 95% CI 1.29-3.05), in smoking primiparas (1.69; 95% CI 1.09-2.63) and multiparas (1.51; 95% CI 1.02-2.25), and in multiparas with unknown smoking status (1.98; 95% CI 1.18-3.33).
  
  
  CONCLUSIONS
  The study provides further evidence that perinatal mortality is positively associated with increased maternal age, unmarried (single) status and smoking.
authors.affiliation: Women's Clinic, University of Tartu, Estonia.
authors.forename: H
authors.initials: H
authors.lastname: Karro
authors.forename: M
authors.initials: M
authors.lastname: Rahu
authors.forename: K
authors.initials: K
authors.lastname: Gornoi
authors.forename: A
authors.initials: A
authors.lastname: Baburin
mesh_terms: D000328:Adult; D001723:Birth Rate; D004522:Educational Status; D004957:Estonia; D005006:Ethnicity; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D017533:Marital Status; D008423:Maternal Age; D016017:Odds Ratio; D012042:Registries; D012907:Smoking