Table 1. Baseline characteristics of grade 1 (n = 2760) and grade 7 (n = 2198) children.
| Young group | Older group | P | |
|---|---|---|---|
| Age (y) | 7.1±0.4 | 12.7±0.5 | <0.01 |
| Gender (female, %) | 1154(41.8) | 1072(48.8) | <0.01 |
| SE (D) | 0.9±0.9 | -1.5±2.0 | <0.01 |
| Axial length (mm) | 22.7±0.7 | 24.1±1.0 | <0.01 |
| Anterior Chamber depth (mm) | 2.9±0.2 | 3.6±0.3 | <0.01 |
| Intraocular pressure (mmHg) | 13.5±3.1 | 15.8±3.5 | <0.01 |
| Boys | 13.3±3.0 | 15.5±3.4 | |
| Girls | 13.8±3.2 | 16.2±3.5 | |
| Hyperopia | 13.3±3.0 | 14.3±3.3 | |
| Emmetropia | 13.7±3.1 | 15.3±3.3 | |
| Myopia | 14.0±3.1 | 16.2±3.5 | |
| Central corneal thickness (um) | 540±31 | 538±34 | 0.07 |
| Parental myopia (n, (%)) | <0.01 | ||
| None | 1307 (60.3) | 1282 (69.7) | |
| Either | 666 (30.7) | 440 (23.9) | |
| Both | 194 (9.0) | 117 (6.4) | |
| Systolic blood pressure (mmHg) | 97.3±10.2 | 105.5±11.6 | <0.01 |
| Diastolic blood pressure (mmHg) | 58.3±9.4 | 66.1±9.8 | <0.01 |
| Mean arterial pressure (mmHg) | 71.3±9.0 | 79.2±9.4 | <0.01 |
| Height (m) | 123.5±5.5 | 155.0±7.3 | <0.01 |
| Weight (kg) | 24.6±4.8 | 47.7±10.9 | <0.01 |
| BMI (kg/m2) | 16.1±2.4 | 19.8±3.7 | <0.01 |