Study characteristics
| ROP-treated Median (Mean) SD | Comparison infants Median (Mean) SD | |
| Gestational age at birth (days) | 183 (186) 12.6 | 190 (191) 12.2 |
| Birth weight (g) | 778 (848) 215 | 940 (998) 302 |
| Regain of birth weight (postnatal days) | 11 (11) 5 | 12 (12) 4.9 |
| Head circumference (cm)* | 23.8 (24.0) 1.9 | 24.8 (25.0) 2.0 |
| Birth length (cm) | 34 (34.8) 3.2 | 36.0 (36.0) 3.6 |
| n (%) | n (%) | |
| Small for gestational age | 37/106 (34.9) | 37/203 (18.2) |
| Males | 62/106 (58.5) | 93/204 (45.6) |
| Multiple births | 45/106 (42.5) | 74/204 (36.3) |
| Death (<3 postnatal month of life) | 1/106 (0.01) | 0/204 (0.0) |
*Head circumference was measured during the first postnatal week. When two values existed, a mean was calculated.