Summary of baseline characteristics by cohort
| Characteristic | SAIL | UK Biobank |
|---|---|---|
| n | 1 845 040 | 466 561 |
| Female sex, n (%) | 1 015 078 (55.0) | 253 258 (54.3) |
| Age, years, median (IQI) | 53 (37–67) | 58 (50–63) |
| Ethnicity, n (%)a | ||
| White | 441 848 (94.7) | |
| Black | 8241 (1.8) | |
| Asian | 11 293 (2.4) | |
| Mixed | 1013 (0.2) | |
| Other | 4166 (0.9) | |
| Diabetes mellitus, n (%) | 310 352 (16.8) | 24 241 (5.2) |
| Hypertension, n (%) | 569 918 (30.9) | 111 475 (23.9) |
↵a Ethnicity was not consistently recorded in SAIL. The Welsh population is approximately 95.0% White.18 IQI = interquartile interval. SAIL = Secure Anonymised Information Linkage Databank.