Table 2

- Comparison of baseline characteristics.

Groups	Mild BPD (n=590)	Moderate BPD (n=250)	sBPD (n=82)	H/c²	P-values
GA (weeks)	29.1 (28.1-30)	28.7 (27.3-29.7)^*	27.7 (26.6-29.3)^*	34.601	<0.001
BW (g)	1187 (1023-1320)	1085 (924-1250)^*	1025 (875-1160)^*	49.159	<0.001
Antenatal corticosteroids	489 (82.9)	190 (76.0)	54 (65.9)^*	15.389	<0.001
Male gender	321 (54.4)	143 (57.2)	54 (65.9)	3.976	0.137
Cesarean delivery	351 (59.5)	133 (53.2)	42 (51.2)	4.085	0.130
Multiple births	197 (33.4)	105 (42.0)	31 (37.8)	5.753	0.056
SGA	80 (13.6)	39 (15.6)	13 (15.9)	0.769	0.681
Five-minute Apgar score of ≤7	94 (15.9)	37 (14.8)	38 (15.0)^†	47.327	<0.001
Gestational hypertension	122 (20.7)	49 (19.6)	15 (18.3)	0.324	0.850
Gestational diabetes	106 (18.0)	48 (19.2)	10 (12.2)	2.108	0.349

Values are presented as numbers and precentages (%) or median and interquartile range (IQR).

BPD: bronchopulmonary dysplasia, sBPD: severe bronchopulmonary dysplasia, GA: gestational age, BW: birth weight, SGA: small for gestational age