Table 1.

Comparison of birth weight, gestational age, and age at presentation among infants with/without ROP, severe/nonsevere ROP, and those with favorable/unfavorable outcomes

	Mean Birth Weight (in grams)	Mean Period of Gestation (weeks)	Mean Age at Presentation (weeks)
ROP	1277±345	29.5±2.6	10.2±13.7
No ROP	1534±408	32.2±2.6	5.9±4.0
P	<0.01	<0.01	<0.01
Severe ROP	1267±349	29±2.4	13.0±17.3
Nonsevere ROP	1290±334	30±2.3	6.8±5.2
P	0.3	<0.01	<0.01
Favorable outcome	1253±359	29±2.3	5.9±2.4
Unfavorable outcome	1198±275	28.6±2.6	7.3±4.5
P	0.39	0.3	<0.01