title: Hospital variation and risk factors for bronchopulmonary dysplasia in a population-based cohort.
abstract: OBJECTIVE
  Bronchopulmonary dysplasia (BPD) remains a serious morbidity in very low-birth-weight (VLBW) infants (<1500 g). Deregionalization of neonatal care has resulted in an increasing number of VLBW infants treated in community hospitals with unknown impact on the development of BPD.
  
  
  OBJECTIVE
  To identify individual risk factors for BPD development and hospital variation of BPD rates across all levels of neonatal intensive care units (NICUs) within the California Perinatal Quality Care Collaborative.
  
  
  METHODS
  Retrospective cohort study (January 2007 to December 2011) from the California Perinatal Quality Care Collaborative including more than 90% of California's NICUs. Eligible VLBW infants born between 22 to 29 weeks' gestational age.
  
  
  METHODS
  Varying levels of intensive care.
  
  
  METHODS
  Bronchopulmonary dysplasia was defined as continuous supplemental oxygen use at 36 weeks' postmenstrual age. A combined outcome of BPD or mortality prior to 36 weeks was used. Multivariable logistic regression accounting for hospital as a random effect and gestational age as a risk factor was used to assess individual risk factors for BPD. This model was applied to determine risk-adjusted rates of BPD across hospitals and assess associations between levels of care and BPD rates.
  
  
  RESULTS
  The study cohort included 15,779 infants, of which 1534 infants died prior to 36 weeks' postmenstrual age. A total of 7081 infants, or 44.8%, met the primary outcome of BPD or death prior to 36 weeks. Combined BPD or death rates across 116 NICUs varied from 17.7% to 73.4% (interquartile range, 38.7%-54.1%). Compared with level IV NICUs, the risk for developing BPD was higher for level II NICUs (odds ratio, 1.23; 95% CI, 1.02-1.49) and similar for level III NICUs (odds ratio, 1.04; 95% CI, 0.95-1.14).
  
  
  CONCLUSIONS
  Bronchopulmonary dysplasia or death prior to 36 weeks' postmenstrual age affects approximately 45% of VLBW infants across California. The wide variability in BPD occurrence across hospitals could offer insights into potential risk or preventive factors. Additionally, our findings suggest that increased regionalization of NICU care may reduce BPD among VLBW infants.
authors: Department of Pediatrics, Stanford University School of Medicine, Stanford, California2California Perinatal Quality Care Collaborative, Stanford, California.
authors: Wannasiri
authors: W
authors: Lapcharoensap
authors: Department of Pediatrics, Stanford University School of Medicine, Stanford, California2California Perinatal Quality Care Collaborative, Stanford, California.
authors: Susan C
authors: SC
authors: Gage
authors: Department of Pediatrics, Stanford University School of Medicine, Stanford, California2California Perinatal Quality Care Collaborative, Stanford, California.
authors: Peiyi
authors: P
authors: Kan
authors: Department of Pediatrics, Stanford University School of Medicine, Stanford, California2California Perinatal Quality Care Collaborative, Stanford, California.
authors: Jochen
authors: J
authors: Profit
authors: Department of Pediatrics, Stanford University School of Medicine, Stanford, California2California Perinatal Quality Care Collaborative, Stanford, California.
authors: Gary M
authors: GM
authors: Shaw
authors: Department of Pediatrics, Stanford University School of Medicine, Stanford, California2California Perinatal Quality Care Collaborative, Stanford, California.
authors: Jeffrey B
authors: JB
authors: Gould
authors: Department of Pediatrics, Stanford University School of Medicine, Stanford, California2California Perinatal Quality Care Collaborative, Stanford, California.
authors: David K
authors: DK
authors: Stevenson
authors: Department of Pediatrics, Stanford University School of Medicine, Stanford, California2California Perinatal Quality Care Collaborative, Stanford, California.
authors: Hugh
authors: H
authors: O'Brodovich
authors: Department of Pediatrics, Stanford University School of Medicine, Stanford, California2California Perinatal Quality Care Collaborative, Stanford, California.
authors: Henry C
authors: HC
authors: Lee
mesh_terms: D000328:Adult; D001034:Apgar Score; D001997:Bronchopulmonary Dysplasia / Q000453:epidemiology* / Q000628:therapy; D002140:California / Q000453:epidemiology; D015331:Cohort Studies; D005260:Female; D005322:Premature Rupture of Fetal Membranes / Q000453:epidemiology; D005865:Gestational Age; D017052:Hospital Mortality; D006801:Humans; D006973:Hypertension / Q000453:epidemiology; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D019102:Infant, Very Low Birth Weight; D007363:Intensive Care Units, Neonatal / Q000458:organization & administration*; D015931:Intensive Care, Neonatal / Q000458:organization & administration*; D008297:Male; D009099:Multiple Birth Offspring; D015999:Multivariate Analysis; D010102:Oxygen Inhalation Therapy; D011247:Pregnancy; D012189:Retrospective Studies; D012307:Risk Factors; D012737:Sex Factors; D055815:Young Adult