Table 1.

Birth characteristics and ROP outcomes in extremely preterm infants born 2007–2018 (n=399)

Birth characteristics
Birth weight, mean (g)	567 (340 to 874)
Gestational age, mean (weeks)	23.2 (21.9 to 23.9)
Sex (female)	188/399 (47.1)
ROP outcome
No ROP	34/399 (8.5)
ROP stages 1 and 2	125/399 (31.3)
ROP stage 3	227/399 (56.9)
ROP stages 4 and 5	13/399 (3.2)
ROP treatment	173/399 (43.4)
ROP retreatment	68/173 (39.3)

Values are presented as mean (max and min) or n (%).

ROP, retinopathy of prematurity.