Table 1. Demographic data of the patient and control groups.
| Cases (41 eyes, 24 patients) | Controls (60 eyes, 33 patients) | P-value | |
|---|---|---|---|
| Age (years) | 15.2±2.84 Median 16 Range 11–19 | 17.3±3.21 17 12–24 | 0.015 |
| M:F | 12:12 | 16:17 | 0.91 |
| Gestational age (weeks) | 26±1.75 Range 23–30 | 40±1.54 37–42.14 | <0.00005 |
| Birthweight (g) | 854±191 Range 512–1190 | 3598±496 2296–4678 | <0.00005 |
| Spherical equivalent (D) | −2.73±4.19 | −0.35±2.80 | 0.02 |
| Visual acuity | All eyes: 0.06±0.17 Subgroupa: −0.02±0.12 | −0.07±0.11 −0.09±0.06b | <0.0005 0.02 |
| Treatment (eyes) | |||
| Laser | 28 | ||
| Cryotherapy | 10 | ||
| Both | 1 | ||
| Untreated | 2 | ||
a
Subgroup refers to regressed ROP eyes without ocular copathology that could affect visual acuity (n=29 eyes).
b
Refers to control eyes without amblyopia (n=58).