Study population
birth defects, respiratory illness
PERINATAL DISEASE
Infants were recruited as part of a prospective nested cohort study from the Breathing for Life Trial (BLT). As previously described [After birth infants were clinically assessed in Newcastle, Australia at six weeks corrected gestational age. Inclusion criteria for eNO measurement was no apparent major birth defects or perinatal disease that would preclude performing unsedated infant lung function testing and that the infant had not had a respiratory illness in the two weeks prior to testing.