Table 2. Demographic Data During the Neonatal Period and at the 6.5-Year Follow-up.
| Characteristic | Preterm Group (n = 52) |
Control Group (n = 45) |
|---|---|---|
| Age at examination, mean (SD) [range], y | 6.6 (0.1) [6.3 to 6.7] | 6.6 (0.1) [6.3 to 6.7] |
| Sex, No. | ||
| Boys | 33 | 23 |
| Girls | 19 | 22 |
| GA, mean (SD) [range], wk | 25 (1.1) [22 to 26] | 40 (1.1) [37 to 41] |
| Week, No. | ||
| 22 | 1 | NA |
| 23 | 5 | NA |
| 24 | 10 | NA |
| 25 | 17 | NA |
| 26 | 19 | NA |
| BW, mean (SD) [range], g | 766 (175) [492 to 1218] | 3636 (427) [2740 to 4360] |
| ROP stages, No. | ||
| None | RE: 21; LE: 20 | NA |
| Mild | RE: 20; LE: 23 | NA |
| Severe | RE: 11; LE: 9 | NA |
| Treatment for ROP | RE: 6; LE: 5 | NA |
| logMAR VA, mean (SD) [range]a | RE: 0.13 (0.20) [0.00 to 0.70]; LE: 0.12 (0.31) [−0.10 to 2.00] | RE: 0.03 (0.06) [−0.10 to 0.20]; LE: 0.03 (0.07) [−0.10 to 0.20] |
| Snellen fraction VA, mean (range) | RE: 20/25 (20/100 to 20/20); LE: 20/26 (20/2000 to 20/16) | RE: 20/21 (20/32 to 20/16); LE: 20/21 (20/32 to 20/16) |
| Refraction, spherical equivalent, mean (SD) [range]b | RE: 1.59 (2.34) [−7.63 to 7.50]; LE: 1.18 (3.44) [−13.25 to 7.38] | RE: 1.39 (0.70) [−0.25 to 4.00]; LE: 1.35 (0.64) [−0.25 to 3.63] |
Abbreviations: BW, birth weight; GA, gestational age; LE, left eye; NA, not applicable; RE, right eye; ROP, retinopathy of prematurity; VA, visual acuity.
a
Preterm group: 50 right eyes and 48 left eyes; control group: 45 right eyes and 45 left eyes.
b
Preterm group: 50 right eyes and 48 left eyes; control group: 44 right eyes and 44 left eyes.