title: [Relationship in Spain of the length of the gestation and the birth weight with mother's nationality during the period 2001-2005].
abstract: BACKGROUND
  Association between immigration and low birth weight (LBW) and preterm birth (PB) is an important indicator of health inequalities. The objective of this study is to analyse the differences between LBW and PB according to the mothers nationality in newborns in Spain.
  
  
  METHODS
  Data were provided from the National Statistical Bulletin of Birth of 1,878,718 newborns in the period 2001-2005. The nationality was considered the exposure variable (Spanish- Immigrant). The outcomes were LBW (< 2,500 gr and >or=37 gestational weeks) and PB (< 37 gestational weeks). Odds ratios were calculated and adjusted by possible confounders by logistic regression.
  
  
  RESULTS
  PB and LBW prevalence were higher in Spanish women (7.9% and 3.2% respectively). In comparison with Spanish ones, the lowest risk of PB was observed in North Africa (ORa= 0.77 CI95% 0.74-0.80). With respect to LBW, the lowest risk was found in mothers from South America (ORa=0.62 CI95% 0.59-0.65) and Eastern Europe (ORa=0.65 CI95% 0.60-0.71).
  
  
  CONCLUSIONS
  Results of LBW and PB were more favourable in the births of immigrant women. It could be associated with the healthy migrant effect and a low frequency of risk practices during gestation.
authors.affiliation: Facultad de Odontología, Universidad de Antioquia, Medellín, Colombia. agudeloandres@odontología.udea.edu.co
authors.forename: Andrés A
authors.initials: AA
authors.lastname: Agudelo-Suárez
authors.forename: Elena
authors.initials: E
authors.lastname: Ronda-Pérez
authors.forename: Diana
authors.initials: D
authors.lastname: Gil-González
authors.forename: Laura I
authors.initials: LI
authors.lastname: González-Zapata
authors.forename: Enrique
authors.initials: E
authors.lastname: Regidor
mesh_terms: D000328:Adult; D001724:Birth Weight; D004641:Emigration and Immigration; D005260:Female; D005865:Gestational Age; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D009035:Mothers; D047928:Premature Birth / Q000453:epidemiology*; D015995:Prevalence; D013030:Spain; D055815:Young Adult