title: Preconceptional factors associated with very low birthweight delivery in East and West Berlin: a case control study.
abstract: BACKGROUND
  Very low birthweight, i.e. a birthweight < 1500 g, is among the strongest determinants of infant mortality and childhood morbidity. To develop primary prevention approaches to VLBW birth and its sequelae, information is needed on the causes of preterm birth, their personal and social antecedents, and on conditions associated with very low birthweight. Despite the growing body of evidence linking sociodemographic variables with preterm delivery, little is known as to how this may be extrapolated to the risk of very low birthweight.
  
  
  METHODS
  In 1992, two years after the German unification, we started to recruit two cohorts of very low birthweight infants and controls in East and West Berlin for a long-term neurodevelopmental study. The present analysis was undertaken to compare potential preconceptional risk factors for very low birthweight delivery in a case-control design including 166 mothers (82 East vs. 84 West Berlin) with very low birthweight delivery and 341 control mothers (166 East vs. 175 West).
  
  
  RESULTS
  Multivariate logistic regression analysis was used to assess the effects of various dichotomous parental covariates and their interaction with living in East or West Berlin. After backward variable selection, short maternal school education, maternal unemployment, single-room apartment, smoking, previous preterm delivery, and fetal loss emerged as significant main effect variables, together with living in West Berlin as positive effect modificator for single-mother status.
  
  
  CONCLUSIONS
  Very low birthweight has been differentially associated with obstetrical history and indicators of maternal socioeconomic status in East and West Berlin. The ranking of these risk factors is under the influence of the political framework.
authors.affiliation: Department of Neonatology, Charité Virchow Hospital; Humboldt University, Berlin, Germany. christoph.buehrer@charite.de
authors.forename: Ingrid
authors.initials: I
authors.lastname: Grimmer
authors.forename: Christoph
authors.initials: C
authors.lastname: Bührer
authors.forename: Joachim W
authors.initials: JW
authors.lastname: Dudenhausen
authors.forename: Andrea
authors.initials: A
authors.lastname: Stroux
authors.forename: Horst
authors.initials: H
authors.lastname: Reiher
authors.forename: Horst
authors.initials: H
authors.lastname: Halle
authors.forename: Michael
authors.initials: M
authors.lastname: Obladen
mesh_terms: D001604:Berlin / Q000453:epidemiology; D016022:Case-Control Studies; D015984:Causality; D015331:Cohort Studies; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D019102:Infant, Very Low Birth Weight; D016015:Logistic Models; D008429:Maternal Welfare; D007752:Obstetric Labor, Premature / Q000453:epidemiology*; D011247:Pregnancy; D015995:Prevalence; D012111:Residence Characteristics; D012307:Risk Factors; D012959:Socioeconomic Factors