Table 1.
Characteristics of the Grade 7 Students According to Sex in Beijing, China
| Median (IQR) | ||||
|---|---|---|---|---|
| Parameters | Total (n = 1197) | Boys (n = 667) | Girls (n = 530) | P |
| Age (y) | 12.00 (1.00) | 12.00 (1.00) | 12.00 (1.00) | 0.038 |
| Height (cm) | 160.10 (10.25) | 163.00 (11.50) | 158.50 (7.20) | <0.001 |
| Spherical equivalent (D) | −2.07 (3.13) | −2.00 (3.00) | −2.19 (3.12) | 0.171 |
| Axial length at baseline (mm) | 24.43 (1.59) | 24.66 (1.55) | 24.18 (1.57) | <0.001 |
| Axial elongation (µm) | 220 (180) | 230 (180) | 200 (160) | 0.032 |
| Subfoveal choroidal thickness (µm) | 262 (97) | 263 (93) | 262 (102) | 0.946 |
| Nasal choroidal thickness (µm) | 155 (66) | 151 (59) | 159 (76) | 0.045 |
| Temporal choroidal thickness (µm) | 276 (80) | 279 (79) | 270 (82) | 0.093 |
| Subfoveal retinal thickness (µm) | 215 (20) | 217 (22) | 213 (20) | 0.002 |
| Nasal retinal thickness (µm) | 296 (25) | 298 (25) | 294 (24) | <0.001 |
| Temporal retinal thickness (µm) | 260 (18) | 262 (17) | 257 (16) | <0.001 |
Wilcoxon rank-sum tests were performed.
Bold indicates statistical significance.