Table 2 Comparison of the characteristics of children with a normal or an adverse ophthalmic outcome at mean age 11 years and 6 months.
| Normal ophthalmic outcome | Adverse ophthalmic outcome | p Value | |
|---|---|---|---|
| (n = 99) | (n = 99) | ||
| n (%) | n (%) | ||
| Sex | |||
| Male | 50 (50.5) | 49 (49.5) | 0.887 |
| Female | 49 (49.5) | 50 (50.5) | (χ2, 1 df) |
| Age of neuropsychological assessment | |||
| Mean (SD) | 12.77 (0.58) | 12.67 (0.62) | 0.240 |
| (t test) | |||
| Birth weight (g) | |||
| Mean | 1363.3 | 1307.5 | 0.145 |
| Number ⩽1000 g | 10 (10.1) | 14 (14.1) | (Mann–Whitney) |
| Median | 1450 | 1300 | |
| IQR | 1150, 1560 | 1140, 1540 | |
| Gestational age (weeks) | |||
| Mean (SD) | 31.1 ( 2.79) | 30.5 (3.26) | 0.169 |
| Number ⩽28 weeks | 21 (21.2) | 30 (30.3) | (t test) |
| Retinopathy of prematurity status | |||
| None | 49 (49.5) | 43 (43.4) | 0.013 |
| Stage 1 | 37 (37.4) | 30 (30.3) | (Fisher's exact test) |
| Stage 2 | 13 (13.1) | 18 (18.2) | |
| Stage 3 or 4 | 0 | 8 (8.1) | |
| Neonatal cranial ultrasound | |||
| Abnormal | 34 (30.8) | 27 (27.3) | 0.488 |
| Normal | 26 (29.3) | 32 (32.3) | (χ2, 2 df) |
| Not done | 39 (39.9) | 40 (40.4) | |
| Social class (mother) | |||
| 1 and 2 | 23 (23.2) | 16 (16.2) | 0.283 |
| 3 | 32 (32.3) | 37 (37.4) | (χ2, 3 df) |
| 4 and 5 | 20 (20.2) | 28 (28.3) | |
| Unknown | 24 (24.2) | 18 (18.2) | |
| Social class (father) | |||
| 1 and 2 | 27 (27.3) | 28 (28.3) | 0.444 |
| 3 | 28 (28.3) | 37 (37.4) | (χ2, 3df) |
| 4 and 5 | 16 (1.2) | 11 (11.1) | |
| Unknown | 28 (28.3) | 23 (23.2) | |