Table 3.

Comparison of Post-ligation Clinical Features and Morbidity Between Groups

	Group A (≥3 Treatment Cycles), n = 10	Group B (≤2 Treatment Cycles), n = 14	P
Post-ligation invasive MV duration (day), median (min–max)	18 (8-43)	15.5 (7-22)	.196	U
Post-ligation non-invasive MV duration (day), median (min–max)	14.5 (5-28) *	15.5 (3-44)	.494	U
Post-ligation oxygen therapy duration (day), median (min–max)	19.5 (6-22) *	20 ( 9-36)	.607	U
Total (pre + post) invasive MV duration (day), median (min–max)	46 (28-79)	32 ( 24- 44)	.004	U
Hospitalization time day, median (min–max)	100 (83-120)*	79 (56-129)	.101	U
Postconceptional week at discharge, (mean ± SD)	40 ± 2*	38.9 ± 2.2	.248	t
Discharge weight, grams, (mean ± SD)	2563 ± 493*	2543 ± 594	.937	t
BPD				χ2
Mild	0 (0)	1 (7.1)	.019
Moderate	3 (30)	11 (78.6)
Severe	7 (70)	2 (14.3)
ROP				χ2
no	1 (10)	1 (7.1)
Stage 1	1 (10)	7 (50)	.216
Stage 2	5 (50)	3 (21.4)
≥Stage 3	3 (30)	3 (21.4)
PVL, n (%)	1 (10)	1 (7.1)	.803	χ2
Mortality, n (%)	2 (20)	0 (0)	.081	χ2

*Group A was evaluated by excluding patients with mortality results (n = 8).

MV, mechanical ventilation; BPD, bronchopulmonary dysplasia; ROP, retinopathy of prematurity; PVL, periventricular leucomalasia; χ ² , chi-square test; t, independent samples t-test.