title: Prenatal predictors of chronic lung disease in very preterm infants.
abstract: OBJECTIVE
  To identify prenatal risk factors for chronic lung disease (CLD) at 36 weeks postmenstrual age in very preterm infants.
  
  
  METHODS
  Data were collected prospectively as part of the ongoing audit of the Australian and New Zealand Neonatal Network (ANZNN) of all infants born at less than 32 weeks gestation admitted to all tertiary neonatal intensive care units in Australia and New Zealand.
  
  
  METHODS
  Prenatal factors up to 1 minute of age were examined in the subset of infants born at gestational ages 22-31 weeks during 1998-2001, and who survived to 36 weeks postmenstrual age (n = 11 453). Factors that were significantly associated with CLD at 36 weeks were entered into a multivariate logistic regression model.
  
  
  RESULTS
  After adjustment, low gestational age was the dominant risk factor, with an approximate doubling of the odds with each week of decreasing gestational age from 31 to less than 25 weeks (trend p<0.0001). Birth weight for gestational age also had a dose-response effect: the lower the birth weight for gestational age, the greater the risk, with infants below the third centile having 5.67 times greater odds of CLD than those between the 25th and 75th centile (trend p<0.0001). There was also a significantly increased risk for male infants (odds ratio 1.51 (95% confidence interval 1.36 to 1.68), p<0.0001).
  
  
  CONCLUSIONS
  These population based data show that the prenatal factors low gestational age, low birth weight for gestational age, and male sex significantly predict the development of chronic respiratory insufficiency in very preterm infants and may assist clinical decision about delivery.
authors.affiliation: Centre for Perinatal Health Services Research, University of Sydney, Sydney, Australia. dhs@perinatal.usyd.edu.au
authors.forename: D J
authors.initials: DJ
authors.lastname: Henderson-Smart
authors.forename: J L
authors.initials: JL
authors.lastname: Hutchinson
authors.forename: D A
authors.initials: DA
authors.lastname: Donoghue
authors.forename: N J
authors.initials: NJ
authors.lastname: Evans
authors.forename: J M
authors.initials: JM
authors.lastname: Simpson
authors.forename: I
authors.initials: I
authors.lastname: Wright
mesh_terms: D000328:Adult; D001724:Birth Weight; D002908:Chronic Disease; D004812:Epidemiologic Methods; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D007236:Infant, Small for Gestational Age; D008297:Male; D011379:Prognosis; D012131:Respiratory Insufficiency / Q000196:embryology / Q000209:etiology*; D012737:Sex Factors