title: [Birth weight and familial smoking].
abstract: BACKGROUND
  Tobacco smoking during pregnancy is an important risk factor in the pediatric population and has been associated with an increase in low birth weight (LBW) infants.
  
  
  METHODS
  We carried out a retrospective case-control study of infants admitted to the Infants Department of the Hospital Universitario Infantil Niño Jesús in Madrid. Data from 2370 infants admitted to the hospital between 2002 and 2004 were collected.
  
  
  RESULTS
  The odds ratio (OR) for having a LBW infant was 1.42 (95 % CI: 1.017-1.985) among mothers who smoked during pregnancy and was 1.37 (95 % CI: 1.014-1.863) among women whose partners smoked. Gestational age was also a predictive factor of birth weight: the OR was 0.585 (95 % CI: 0.545-0.628). No significant differences for risk of LBW were found between sexes (OR: 1.25; 95 % CI: 0.934-1.671).
  
  
  CONCLUSIONS
  Our results should reinforce the importance of smoking prevention during and after pregnancy in both parents, which could reduce many complications in children's health with a high medical, social and economic cost.
authors.affiliation: Pediatría. Hospital Infantil Universitario Niño Jesús, Madrid, España.
authors.forename: A
authors.initials: A
authors.lastname: Alonso Ojembarrena
authors.forename: J
authors.initials: J
authors.lastname: Cano Fernández
authors.forename: A
authors.initials: A
authors.lastname: Girón Velasco
authors.forename: G
authors.initials: G
authors.lastname: Yep Chullen
authors.forename: M
authors.initials: M
authors.lastname: Sánchez Bayle
mesh_terms: D000328:Adult; D001724:Birth Weight; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D012189:Retrospective Studies; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects*; D014028:Tobacco Smoke Pollution / Q000009:adverse effects*
chemical_list: D014028:Tobacco Smoke Pollution