title: Prediction of respiratory outcome in extremely low gestational age infants.
abstract: BACKGROUND
  Bronchopulmonary dysplasia (BPD) is a commonly used outcome for randomized neonatal trials.
  
  
  OBJECTIVE
  The aim of the present study was to determine whether a diagnosis of BPD or respiratory morbidity (RM1 or RM2) at 12 months corrected age better predicted subsequent RM in extremely low gestational age infants (23-28 weeks of gestation).
  
  
  METHODS
  Initial analysis was undertaken in a development cohort of 76 infants who underwent pulmonary function tests (PFTs) at 12 months corrected age. Parents completed infant respiratory diaries 2 weeks before the PFTs. Analysis was then undertaken in a validation cohort of 227 infants whose parents completed a 4-week respiratory diary when their infant was 12 months corrected age. BPD at 28 days (BPD28d) and 36 weeks post-menstrual age (BPD36w), RM1 (≥3 days and/or nights of cough, wheeze, and/or medicine use) and RM2 (≥4 days and/or nights of cough, wheeze, and/or respiratory medicine use) each week for 2 weeks at 12 months corrected age were assessed with regard to prediction of respiratory outcomes at 24 months documented by respiratory health questionnaires.
  
  
  RESULTS
  BPD28d and BPD36w were not significantly associated with any respiratory outcome. Areas under the receiver operating characteristic curves were significantly better for either definition of RM than BPD28d or BPD36w for all outcomes.
  
  
  CONCLUSIONS
  RM documented by parental completed diaries at 12 months corrected age better predicted respiratory outcome at 24 months corrected age than BPD regardless of diagnostic criteria.
authors.affiliation: Department of Pediatric Newborn Medicine, Brigham and Women's Hospital, Boston, Mass., USA.
authors.forename: Richard B
authors.initials: RB
authors.lastname: Parad
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Davis
authors.forename: Jessica
authors.initials: J
authors.lastname: Lo
authors.forename: Mark
authors.initials: M
authors.lastname: Thomas
authors.forename: Neil
authors.initials: N
authors.lastname: Marlow
authors.forename: Sandy
authors.initials: S
authors.lastname: Calvert
authors.forename: Janet L
authors.initials: JL
authors.lastname: Peacock
authors.forename: Anne
authors.initials: A
authors.lastname: Greenough
mesh_terms: D001997:Bronchopulmonary Dysplasia / Q000503:physiopathology*; D005260:Female; D005865:Gestational Age; D006801:Humans; D007223:Infant; D062071:Infant, Extremely Premature; D007231:Infant, Newborn; D008297:Male; D012372:ROC Curve; D012129:Respiratory Function Tests; D012307:Risk Factors