Table 2.

The prevalence ratio (PR) of risk factors for complications

Risk factor	PR	P value
Laterality (OD/OS)	1.001	0.995
Gender (male/female)	0.321	0.073
Zone (1/2)	4.386	0.010
NVI	5.091	0.014
Intubation	1.224	0.732
Twin	1.040	0.954
Transfusion	0.950	0.931
IVH	1.460	0.714
Sepsis	1.542	0.464
Phototherapy	2.013	0.313
Anemia	0.542	0.553
ARDS	1.362	0.607

NVI iris neovascularization, IVH intraventricular hemorrhage, ARDS acute respiratory distress syndrome