Demographic factors of the children under investigation
| Sex | Male:female (n) | 53:49 |
| Age (years) | Mean (SD) | 11.85 (3.17) |
| Laterality | Right:left | 85:17 |
| Ethnicity | Caucasian | 57 |
| Mixed | 19 | |
| Asian or Asian British | 1 | |
| Caribbean/African/any other Black background | 8 | |
| Other ethnic groups (including Chinese) | 11 | |
| Not stated or not recorded | 6 | |
| Pachymetry | Median (IQR)* | 581 (537, 622) |
*IQR interquartile range, 19 children had no pachymetry readings.