title: Outcomes for high risk New Zealand newborn infants in 1998-1999: a population based, national study.
abstract: OBJECTIVE
  To determine short term morbidity and mortality outcomes, provision of care, and treatments for a national cohort of high risk infants born in 1998-1999 and admitted to New Zealand neonatal intensive care units (NICUs).
  
  
  METHODS
  All level III (six) and level II (13) NICUs in New Zealand.
  
  
  METHODS
  Prospective audit by the Australian and New Zealand Neonatal Network (ANZNN) of all infants defined as "high risk" (born at < 32 weeks gestation or < 1500 g birth weight, or received assisted ventilation for four hours or more, or had major surgery). Data were collected from birth until discharge home or death.
  
  
  RESULTS
  There were 3368 high risk infants (3.0% of all live births), comprising 1241 (37%) < 32 weeks gestation, 1084 (32%) < 1500 g, 3156 (94%) who received assisted ventilation, and 243 (7%) who received major surgery (categories overlap). Most infants (87%) received some care in tertiary hospitals, and 13% were cared for entirely in non-tertiary hospitals. Survival was 91% for infants < 32 weeks gestation, 97% for infants > or = 32 weeks gestation who received assisted ventilation, and 92% for infants > or = 32 weeks gestation who had major surgery. The proportion of very preterm infants who survived free of early major morbidity was 11%, 28%, 53%, 81%, and 90% for infants born at < 24, 24-25, 26-27, 28-29, and 30-31 weeks gestation respectively.
  
  
  CONCLUSIONS
  These unique population based national data provide contemporary information on the care and early morbidity and mortality outcomes for all high risk infants, whether cared for in hospitals with level III or level II NICUs.
authors.affiliation: Centre for Perinatal Health Services Research, University of Sydney, NSW 2006, Australia.
authors.forename: A E
authors.initials: AE
authors.lastname: Cust
authors.forename: B A
authors.initials: BA
authors.lastname: Darlow
authors.forename: D A
authors.initials: DA
authors.lastname: Donoghue
mesh_terms: D015331:Cohort Studies; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D005865:Gestational Age; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000401:mortality* / Q000601:surgery; D007235:Infant, Premature, Diseases / Q000401:mortality; D007363:Intensive Care Units, Neonatal / Q000706:statistics & numerical data; D008297:Male; D008485:Medical Audit; D009017:Morbidity; D009520:New Zealand / Q000453:epidemiology; D011446:Prospective Studies; D012121:Respiration, Artificial; D012307:Risk Factors; D016896:Treatment Outcome