Table 3.

Mean gestational age at discharge (±std. error) by ROP level and gestational age category

ROP severity	Total	22–24 weeks	25–27 weeks	28–30 weeks
No ROP	36.0 ± 0.16	37.0 ± 3.0	36.7 ± 2.5	35.9 ± 2.0
Stage 1	38.2 ± 0.17	39.2 ± 2.9	38.2 ± 4.3	37.8 ± 3.1
Stage 2	40.5 ± 0.26	40.7 ± 4.3	40.2 ± 4.1	39.7 ± 4.1
Stage 3	44.0 ± 0.43	43.9 ± 5.1	43.3 ± 3.8	45.3 ± 4.1