Table 1.

Clinical variables that correlated with oxygen use at 14 days of age for 1340 preterm infants: 23–27⁺⁶ weeks of gestation

	O2 use (%)
	Low	Increasing	Persistent
Percentage oxygen at 14 days	21	40	49
Percentage of population	20	38	43
Antenatal exposures
Corticosteroids	92	91	88
Chorioamnionitis	55	54	53
Funicitis	40	33	32
Postnatal exposures
Surfactant	78	89	97
Presumed sepsis	27	34	41
Echo-diagnosed PDA	36	48	57
CPAP at 7 days	50	30	10
Conventional or high frequency ventilation at 7 days	21	57	84
BPD: oxygen/ventilation at 36 weeks	17	51	67

Data from Laughon et al.⁴

PDA, patent ductus arteriosus; CPAP, continuous positive airway pressure; BPD, bronchopulmonary dysplasia.