Table 4.

Comparison of Data According to Severe BPD, which is the Main Outcome of the Study

	Severe BPD (+) (n = 9)	Severe BPD (−) (n = 15)	P
Male Gender, n (%)	5 (55)	8 (53)	.916	χ2
Need of Delivery Room Resuscitation, n (%)	6 (66)	11 (73)	.728	χ2
Presence of antenatal corticosteroids, n (%)	5 (55)	10 (66)	.568	χ2
Birthweight, g (mean ± SD)	940 ± 218	921 ± 179	.819	t
Gestational weeks, (mean ± SD)	27.3 ± 2.1	26.3 ± 2.9	.299	t
Surfactant dose number, median (min–max)	2 (1-4)	2 (1-3)	.897	U
Day of PDA diagnosis, (mean ± SD)	7.2 ± 2.1	6.2 ± 3.3	.416	t
Pre-ligation invasive MV duration, day, median (min–max)	31 (22- 40)	17 (13-26)	.000	U
Pre-ligation sepsis, n (%)	5 (55)	4 (27)	.157	χ2
Ligation day, median (min–max)	37 (24-56)	17 (13-35)	.000	U
Post-ligation invasive MV duration, median (min–max)	21 (8-43)	14 (7-21)	.045	U
Post-ligation non-invasive MV duration, day, median (min–max)	14 (5-44)*	15 (3-25)	.972	U
Post-ligation oxygen therapy duration, day, median (min–max)	20 (6-25)*	20 (9-36)	.944	U
Total invasive MV duration, day, (mean ± SD)	105 (47-129)	31 (24-45)	.000	U
PDA diameter (mm)	3.1 ± 0.6	2.7 ± 0.6	.158	t
LA/Ao ratio	1.5 ± 0.06	1.48 ± 0.08	.366	t

*Cases resulting with mortality among patients with severe BPD were excluded (n = 7).

BPD, bronchopulmonary dysplasia; PDA, patent ductus arteriosus; MV, mechanical ventilation; LA/Ao, left atrium aortic root ratio; χ ² , chi-square test; t, independent samples t-test; U, Mann–Whitney U-test.