Descriptive data of 232 children treated for ROP during 2007–2014 and registered in the Swedish national quality register for ROP
| Sex | N (%) | |
| Girl | 92 (39.48) | |
| Boy | 140 (60.32) | |
| Age at examination (year) | Mean (SD) | 6.57 |
| Median | 6.5 | |
| Range | 2.8–12.3 | |
| GA at birth (week) | Mean (SD) | 24.97 (1.63) |
| Median | 24.71 | |
| Range | 22.0–30.14 | |
| BW (gram) | Mean (SD) | 699 (175) |
| Median | 668 | |
| Range | 400–1230 | |
| BWSDS | Mean (SD) | −0.34 (0.85) |
| Median | −0.25 | |
| Range | -2.6-1.4 | |
| BPD | N (%) | |
| Yes | 159 (68.53) | |
| No | 73 (31.47) | |
| NEC | N (%) | |
| Yes | 44 (18.97) | |
| No | 188 (81.03) | |
| Brain lesion | N (%) | |
| Yes | 32 (13.79) | |
| No | 200 (86.21) | |
| Maximum no of treatments | Mean (SD) | 1.44 (0.74) |
| Median | 1 | |
| Range | 1-5 | |
| PNA at first treatment | Mean (SD) | 12.87 (2.90) |
| Median | 12.43 | |
| Range | 7.0–25.57 | |
| PMA at first treatment | Mean (SD) | 37.85 (3.13) |
| Median | 37.14 | |
| Range | 32.43–52.14 |
Brain lesion defined as intraventricular hemorrhage ≥3 and/or periventricular leukomalacia.
BPD, bronchopulmonary disease; BW, birth wt; BWSDS, birth weight SD score; GA, gestational age; NEC, necrotising enterocolitis; n, number; PMA, postmenstrual age; PNA, postnatal age; ROP, retinopathy of prematurity.