title: Secular trends in pregnancy outcomes in 1980-1999 in the Komi Republic, Russia.
abstract: OBJECTIVE
  To describe secular trends in selected pregnancy outcomes in the Komi Republic, Russia, in 1980-1999.
  
  
  METHODS
  A descriptive study.
  
  
  METHODS
  Data on all single infants born in Syktyvkar and Vorkuta during the period 1980-1999 were abstracted from the birth journals at maternity homes (n = 69,340). Proportions of stillbirths, preterm and post-term births as well as the mean values for birth weight and length of term infants were estimated in each of the locations over time and summarized in 5-year periods. Multiple logistic and linear regression analyses were used to study independent effects of the time periods on the outcomes, adjusted for maternal age in Syktyvkar and for maternal age, parity and infant gender in Vorkuta.
  
  
  RESULTS
  Considerable variations over time were observed for all studied outcomes except for stillbirths. The lowest prevalence of both preterm and post-term births was observed in 1985-1989 in both Syktyvkar (4.3% and 3.2%) and Vorkuta (3.5% and 3.1%). Average birth weight in term infants was significantly lower in 1995-1999 in both Syktyvkar (-33 g, 95% CI: -46,-21) and Vorkuta (-81 g, 95% CI: -100, -62) than in 1980-1984.
  
  
  CONCLUSIONS
  The proportions of preterm and post-term births increased while the average birth weight in term infants decreased over the 20-year period of observation. Further research should address those factors that could explain the observed pattern of pregnancy outcomes in the Komi Republic.
authors.affiliation: Komi Branch of Kirov Medical Academy, Syktyvkar, Komi Republic, Russia.
authors.forename: Anna
authors.initials: A
authors.lastname: Kozlovskaya
authors.forename: Evgenij
authors.initials: E
authors.lastname: Bojko
authors.forename: Jon Oyvind
authors.initials: JO
authors.lastname: Odland
authors.forename: Andrej M
authors.initials: AM
authors.lastname: Grjibovski
mesh_terms: D000328:Adult; D001110:Arctic Regions / Q000453:epidemiology; D001724:Birth Weight; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D011247:Pregnancy; D011256:Pregnancy Outcome / Q000453:epidemiology*; D012426:Russia / Q000453:epidemiology