Table 2.

Postnatal Hospitalization Data

	No Late Respiratory Disease (n = 86) [n (%) or Median (IQR)]	Late Respiratory Disease (n = 135) [n (%) or Median (IQR)]	P Value
Surfactant in delivery room	69 (80.2)	121 (89.6)	0.050
Mechanical ventilation support at 7 d	27 (31.4)	60 (44.4)	0.053
Echocardiogram findings at 7 d
PFO	74 (86.0)	105 (77.8)	0.127
VSD	3 (3.5)	4 (3.0)	0.828
Measurable TRJV	7 (8.1)	15 (11.1)	0.472
RV hypertrophy	0 (0)	4 (3.0)	0.107
RV dilation	0 (0)	6 (4.4)	0.047
Septal wall flattening	20 (23.3)	55 (40.7)	0.007
PDA	26 (30.2)	50 (37.0)	0.299
PVD	23 (26.7)	67 (49.6)	0.001
PDA, medical treatment	36 (41.9)	50 (37.0)	0.052
PDA, surgical ligation	12 (14.0)	23 (17.0)	0.440
IVH (grade 3 or 4)	4 (4.7)	5 (3.7)	0.728
Necrotizing enterocolitis	10 (11.6)	25 (18.5)	0.171
Threshold retinopathy	5 (5.8)	24 (17.8)	0.010
BPD (NIH multilevel)			0.042
None	20 (23.3)	20 (14.8)
Mild	34 (39.5)	45 (33.3)
Moderate	20 (23.3)	30 (22.2)
Severe	12 (14.0)	40 (29.6)
BPD (dichotomous)			0.033
No BPD	54 (62.8)	65 (48.1)
BPD	32 (37.2)	70 (51.9)
PH at 36 wk PMA	5 (5.8)	23 (17.0)	0.014
Days on MV	6 (2–19)	20 (4–50)	<0.001
Total oxygen days (NICU)	60 (40–96)	87 (47–112)	0.013
Length of NICU stay, d	83 (69–100)	97 (79–124)	<0.001
Discharged on oxygen	45 (52.3)	76 (56.3)	0.563
Age successfully taken off oxygen, d	74 (46–138)	133 (59–265)	0.003

Definition of abbreviations: BPD = bronchopulmonary dysplasia; IQR = interquartile range; IVH = intraventricular hemorrhage; MV = mechanical ventilation; NICU = neonatal ICU; PDA = patent ductus arteriosus; PFO = patent foramen ovale; PH = pulmonary hypertension; PMA = postmenstrual age; PVD = pulmonary vascular disease; RV = right ventricle; TRJV = tricuspid regurgitant jet velocity; VSD = ventricular septal defect.