Table 1. Subjects demographics.
| Variable | Group | N (%) | N (%) |
|---|---|---|---|
| Myopia | Myopic | 27 752 (30.3%) | |
| Non-myopic | 63 840 (69.7%) | ||
| High myopia | Highly myopic | 3586 (5.3%) | |
| Non-myopic | 63 840 (94.7%) | ||
| Sex | Male | 42 039 (45.9%) | |
| Female | 49 553 (54.1%) | ||
| Ethnicity | White | 91 592 (100.0%) | |
| Birth order | 1 | 43 009 (47.0%) | |
| 2 | 27 779 (30.3%) | ||
| 3 | 11 663 (12.7%) | ||
| 4+ | 9141 (10.0%) | ||
| Highest qualification | University degree | 32 048 (35.0%) | |
| A-levels or similara | 21 226 (23.2%) | ||
| O-levels or CSEs | 24 774 (27.0%) | ||
| None | 13 544 (14.8%) | ||
| Febrile illness | Age at onset | Any age | Before 17 years |
| Pneumonia | 993 (1.1%) | 400 (0.4%) | |
| Encephalitis | 54 (0.1%) | 10 (0.0%) | |
| Meningitis | 303 (0.3%) | 142 (0.2%) | |
| Rheumatic fever | 206 (0.2%) | 183 (0.2%) | |
| Measles | 657 (0.7%) | 649 (0.7%) | |
| Rubella | 230 (0.3%) | 196 (0.2%) | |
| Mumps | 418 (0.5%) | 371 (0.4%) | |
| Diphtheria | 32 (0.0%) | 31 (0.0%) | |
| Pertussis | 207 (0.2%) | 193 (0.2%) |
a
Includes NVQ, HND, HNC, and other professional qualifications.