Changes in demographics from the start and end of the study window
| Age group | 2012 population (% total) | 2019 population (% total) | Annual change* (95% CI) | P value |
| Preschool (0–4) | 3 393 356 (28.1) | 3 299 637 (26.1) | −13 533 (−27 441 to 374) | 0.055 |
| Younger children (5–9) | 3 083 582 (25.5) | 3 538 206 (28.0) | 66 762 (52 433 to 81 092) | <0.0001 |
| Older children (10–15) | 3 653 288 (30.2) | 3 978 836 (31.5) | 49 491 (20 402 to 78 580) | 0.0059 |
| Adolescents (16–18) | 1 963 979 (16.2) | 1 825 762 (14.4) | −20 960 (−26 060 to −15 861) | <0.0001 |
*Annual change calculated using a linear regression model.