Skip to main content
. 2025 Sep 10;2025:8213936. doi: 10.1155/joph/8213936

Table 1.

Characteristics of extremely low birth weight twins with ROP.

N Sex BW at birth
(g)		 GA at birth
(weeks)		 PMA at primary IVR
(weeks)		 Eye Zone Stage Plus disease Hemorrhage on fibrovascular ridge ROP CCH Interval between IVR and LP
(days)		 ROP CCH when LP Laser spot count Laser power Outcome
1 M 961 26.3 36.3 OD II 2 + − 5 189 4 178 110 1
OS II 2 + − 5 189 4 160 110 1
2 M 892 28.2 34.6 OD II 2 + − 6 195 4 150 110 1
OS II 2 + − 6 195 4 176 110 1
3 M 993 28.2 36.3 OD II 2 + + 5 202 5 150 110 1
OS II 2 + + 5 202 5 139 110 1
4 M 923 29 42.5 OD II 2 + + 6 48 5 180 120 1
OS II 2 + + 6 48 5 190 120 1
5 F 974 29 35.5 OD II 3 + − 7 216 5 203 110 1
OS II 3 + − 7 216 5 234 110 1
6 F 873 29 36.5 OD II 2 + − 6 207 6 220 120 1
OS II 2 + − 6 207 6 240 120 1
7 F 736 26.3 38.1 OD I 3 + + 12 45 8 267 120 1
OS I 3 + + 12 45 8 249 120 1
8 F 785 26.3 36.1 OD II 2 + − 12 209 6 198 110 1
OS II 2 + − 12 209 6 185 110 1
9 F 975 29.1 36.4 OD II 3 + − 6 219 4 179 110 1
OS II 3 + − 6 219 4 148 110 1
10 F 785 29.1 36.4 OD II 3 + − 7 228 5 168 110 1
OS II 3 + − 8 228 5 197 120 1
11 F 735 26.1 39.1 OD I AROP + + 12 180 9 205 120 1
OS I AROP + + 12 180 9 216 120 1
12 F 721 26.1 39.1 OD I AROP + − 12 180 7 190 120 1
OS I AROP + − 12 180 7 220 120 1
13 M 814 26.2 39 OD II 3 + + 8 180 6 179 120 1
OS II 3 + + 8 180 6 205 130 1
14 M 787 26.2 39 OD II 3 + − 7 197 5 169 120 1
OS II 2 + − 6 197 5 208 130 1
15 M 963 28 38 OD II 3 + + 9 198 6 175 120 1
OS II 3 + + 9 198 6 164 120 1
16 M 954 28 38 OD II 3 + − 7 198 5 156 110 1
OS II 3 + − 7 198 5 149 110 1
17 M 734 29.4 41.5 OD II 3 + + 7 66 5 207 110 1
OS II 2 + + 7 66 5 245 120 1
18 M 735 29.4 42.2 OD II 3 + + 9 54 6 237 120 1
OS II 2 + + 9 54 6 256 120 1
19 M 480 23.7 34.8 OD I AROP + + 12 28 12 487 120 1
OS I AROP + + 12 28 12 496 130 1
20 M 500 23.7 34.8 OD I AROP + + 12 28 12 486 120 1
OS I AROP + + 12 28 12 503 130 1
21 F 900 27.4 35.1 OD II 2 + − 8 200 6 245 120 1
OS II 2 + − 8 200 6 231 120 1
22 F 860 27.4 35.1 OD II 2 + − 5 226 4 177 110 1
OS II 2 + − 5 226 4 165 110 1
23 M 970 29.4 35.7 OD II 2 + − 7 220 5 205 120 1
OS II 2 + − 7 220 5 223 110 1
24 M 950 29.4 33.7 OD II 3 + + 8 237 5 246 130 1
OS II 3 + + 8 237 5 261 110 1
Mean (SD) or M (P25, P75)
Range		 831.4 (140.9)
480 to 990		 27.5 (1.7)
23.7 to 29.4		 37.2 (2.4)
33.7 to 42.5		           8 (6, 11)
5 to 12		 197.5 (94.5, 214.3)
28 to 237		 5 (5, 6)
4 to 12		 204 (175.3, 239.3)
139 to 503		 120 (110, 120)
110 to 130		  

Note: IVR, intravitreal injection of ranibizumab.

Abbreviations: AROP, aggressive retinopathy of prematurity; BW, body weight; CCH, cumulative clock hours; GA, gestational age; LP, laser photocoagulation; PMA, postmenstrual age; ROP, retinopathy of prematurity.