Summary of baseline demographic characteristics and their distribution in the study cohort
| Characteristic | No. (%) of patients n = 1 138 532 |
|---|---|
| Sex | |
| Female | 651 890 (57.3) |
| Male | 486 642 (42.7) |
| Location indicator | |
| Missing | 985 (0.1) |
| Urban | 988 768 (86.9) |
| Rural | 148 779 (13.1) |
| Age at surgery date, yr | |
| 18–39 | 5164 (0.4) |
| 40–64 | 234 442 (20.6) |
| ≥ 65 | 898 926 (78.9) |
| Institution type | |
| Missing | 327 439 (28.8) |
| Hospital | 517 511 (45.5) |
| Ambulatory care centre | 270 648 (23.8) |
| Other | 22 934 (2.0) |
| Potential optometrist referral | |
| Yes | 89 524 (78.8) |
| Potential ophthalmologist referral | |
| Yes | 315 416 (27.7) |
| Potential family physician referral | |
| Yes | 967 983 (85.0) |