Table 4.

Correlation between ductal diameter and duration of ductal patency and severity of BPD

	Grade 2 BPD (n = 18)	Grade 1 BPD (n = 27)	p value
PDA any grade (E1/E2/E3), d	55.8 (34.0–68.0)	36.0 (20.9–58.0)	0.031*
PDA grade E2/E3, d	34.5 (23.0–57.5)	25.0 (13.1–37.5)	0.147
PDA grade E2, d	7.3 (3.5–25.5)	12.5 (4.8–27.6)	0.424
PDA grade E3, d	20.0 (6.5–35)	9.0 (3.1–17.4)	0.046*
Duration of MV, d	20.0 (11.0–28.0)	9.0 (6.0–20.0)	0.024*
PDA ligation, n (%)	7 (38.9%)	7 (25.9%)	0.363
Pharmacological therapy, n (%)	16 (88.9%)	23 (85.2%)	1

^*p < 0.05; d, days