Table 2. Multivariable logistic regression analysis for factors associated with ROP stage ≥ 3 in VLBW infants.

Variables	Odds ratio	95% confidence interval	P value
Gestational age	1.017	1.000-1.034	0.050
Birth weight	1.001	1.000-1.002	0.072
RDS	0.361	0.077-1.698	0.197
PDA	2.054	1.111-3.797	0.022
Invasive ventilation days	1.013	1.004-1.023	0.005
Oxygen supplement days	0.994	0.984-1.004	0.220
RBC transfusion	0.958	0.483-1.899	0.902

ROP, retinopathy of prematurity; VLBWI, very-low-birth-weight; RDS, respiratory distress syndrome; PDA, patent ductus arteriosus; RBC, red blood cell.