C16 and C20 cohort demographics till the end of May 2020
| Cohort | C16 | C20 |
| Individuals (N) | 3 087 032 | 3 277 114 |
| Cohort start date | 1 January 2016 | 1 January 2020 |
| Cohort end date | 31 December 2019 | 31 May 2020 |
| Deaths in period | 117 565 (3.8%) | 16 380 (0.5%) |
| Full coverage (cohort end date=31 December 2019/31 May 2020) | 2 651 957 (85.9%) | 3 237 389 (98.8%) |
| Registered with a SAIL providing practice (registration end date >cohort start date) | 2 608 761 (84.5%) | 2 666 331 (81.4%) |
| Mean age (SD) | 41.3 (23.7) | 41.9 (23.8) |
| Sex | ||
| Female | 50.1% | 50.1% |
| WIMD 2019 quintile* | ||
| 1 | 20.3% | 19.1% |
| 2 | 19.9% | 18.5% |
| 3 | 20.1% | 18.4% |
| 4 | 19.7% | 18.1% |
| 5 | 19.9% | 18.3% |
| Missing WIMD | 0.0% | 7.7% |
*WIMD 2019 quintile: 1=most deprived, 5=least deprived, please note a one decimal place rounding error.
SAIL, Secure Anonymised Information Linkage; WIMD, Welsh Index of Multiple Deprivation.