Stage 3 retinopathy of prematurity: zone, severity, extent, and treatment
| Stage 3 severity | Eyes (n = 382) | Birth weight(g) | GA (weeks) | Proportion of eyes treated |
|---|---|---|---|---|
| Values for birth weight are mean (SD). | ||||
| GA, Gestational age. | ||||
| Zone I | 16 (4%) | 671 (130) | 24.5 | 88% (14/16) |
| Zone II: 9–12 hours (plus disease) | 71 (18%) | 740 (148) | 25.3 | 96% (189/197) |
| Zone II: 5–8 hours (plus disease) | 126 (33%) | 784 (283) | 25.5 | |
| Zone II: 1–4 hours (plus disease) | 48 (13%) | 789 (158) | 26.0 | 19% (24/127) |
| Zone II: no plus disease | 79 (21%) | 854 (208) | 26.3 | |
| Zone III | 42 (11%) | 871 (304) | 26.4 | 19% (8/42) |