Demographic data of the study participants
| Group | n | Age (years) (median) | Sex (m/f) | Birth weight (g) (±SD) | Gestational age (weeks) (±SD) | SER (Dpt) (±SD) |
|---|---|---|---|---|---|---|
| Term | 30 | 6–12 (9) | 12/18 | 3488 (±294) | 39.8 (±1) | 0.12 (±0.65) |
| No-ROP | 100 | 7–13 (10) | 54/46 | 1497 (±389) | 30.7 (±2.3) | 0.43 (±2.66) |
| <1000 g | 10 | 7–12 (10) | 6/4 | 917 (±80) | 28.2 (±2.0) | 1.02 (±3.90) |
| 1000–1500 g | 49 | 7–13 (10) | 24/25 | 1299 (±124) | 30.0 (±1.9) | 0.43 (±2.24) |
| >1500 g | 41 | 7–12 (10) | 24/17 | 1857 (±289) | 32.1 (±2.2) | 0.26 (±2.71) |
| ≤28 weeks | 11 | 9–13 (10) | 6/5 | 1061 (±244) | 27.2 (±0.6) | 0.78 (±4.24) |
| >28–<32 weeks | 56 | 7–13 (10) | 33/23 | 1441 (±257) | 30 (±0.7) | 0.38 (±2.67) |
| ≥32 weeks | 33 | 7–12 (10) | 15/18 | 1730 (±423) | 33.6 (±1.5) | 0.42 (±1.99) |
| sr-ROP | 50 | 7–12 (9) | 29/21 | 1056 (±204) | 27.8 (±1.8) | 0.74 (±1.88) |
| <1000 g | 23 | 7–12 (9.1) | 11/12 | 789 (±83) | 26.3 (±0.8) | 0.93 (±1.99) |
| 1000–1500 g | 19 | 7–12 (8.8) | 12/7 | 1222 (±101) | 29.1 (±1.1) | 1.19 (±2.13) |
| >1500 g | 8 | 7–12 (9) | 6/2 | 1618 (±105) | 29.8 (±2.2) | −1.55 (±2.23) |
| ≤28 weeks | 35 | 7–12 (9.2) | 18/17 | 931 (±93) | 26.3 (±0.9) | 1.14 (±1.75) |
| >28–<32 weeks | 15 | 7–12 (8.9) | 11/4 | 1292 (±128) | 29.8 (±1.5) | 0.70 (±2.14) |
| ≥32 weeks | 0 | – | – | – | – | – |
| Stg 1 | 21 | 7–12 (9.1) | 12/9 | 1233 (±136) | 28.3 (±1.7) | 1.12 (±2.33) |
| Stg 2 | 21 | 7–12 (8.9) | 12/9 | 938 (±87) | 27.5 (±0.9) | 1.07 (±2.10) |
| Stg 3 | 8 | 7–12 (9.2) | 5/3 | 883 (±102) | 27.0 (±0.4) | 0.7 (±2.02) |
No-ROP, without resolved retinopathy of prematurity; sr-ROP, spontaneously resolved ROP; SER (Dpt), spherical equivalent of refraction in diopters.