Table. Description of 1 690 733 Adolescents and Young Adults Born in Ontario, Canada, Between 1990 and 2016, and Who Were Aged 14 to 24 Years Between March 1, 2018, and June 30, 2021.
| Characteristic | Participant, No. (%) (N = 1 690 773) |
|---|---|
| Sex | |
| Female | 823 904 (48.7) |
| Male | 866 829 (51.3) |
| Residential income quintile at time 0 | |
| 1 (lowest) | 285 357 (16.9) |
| 2 | 302 190 (17.9) |
| 3 | 333 626 (19.7) |
| 4 | 361 674 (21.4) |
| 5 (highest) | 401 454 (23.7) |
| Unknown | 6432 (0.4) |
| Rural residence at time 0 | |
| Rural | 176 024 (10.4) |
| Unknown | 5677 (0.3) |
| History of self-harm or overdose before time 0 | 26 410 (1.6) |
| Age, median (IQR), y | |
| At time 0 | 17.7 (14.1-21.4) |
| At the start of the COVID-19 pandemic | 19.8 (16.2-23.5) |
| At end of study follow-up | 21.0 (17.3-24.7) |