TABLE 9.

STRATIFICATION OF RISK FACTORS THAT WERE EVALUATED FOR POOR LONG-TERM VISUAL ACUITY OUTCOME

RISK FACTOR	GROUPS
Zone of maximal ROP	Zone I
Gestational age at birth	≤28 wk vs >28 wk
Birth weight	≤750 g vs >750 g
General health	≤60 days ventilation vs >60 days
Gender	Male vs female
IVH	Grade 3–4 vs Grade 0–2
NEC	Yes/no
PVL	Yes/no
Sepsis	Yes/no

IVH = intraventricular hemorrhage; NEC = necrotizing enterocolitis; PVL =