Table 2.

Characteristic of patients in the no retinopathy of prematurity and the retinopathy of prematurity groups

	No ROP group (n=201)	ROP group (n=94)		P
		Nontreated (n=73)	Treated (n=21)
Birth weight (g)	1158.8±246.4	980.6±244.0	767.8±152.0	<0.001*
Gestational age (weeks)	29.6±2.3	27.6±1.7	26.5±1.9	<0.001*
Length of stay in the NICU (days)	52.0±33.7	74.3±37.0	114.9±67.8	<0.001*
Weight gain at 6 weeks (g)	523.6±218.3	429.0±193.6	410.0±171.7	0.002*
Apgar score at 1 min	5.5±2.2	5.1±2.2	4.7±2.6	0.076
Apgar score at 5 min	7.8±1.5	7.5±1.7	7.7±1.6	0.153

ROP: Retinopathy of prematurity, NICU: Neonatal intensive care units