Baseline characteristics of the study population
| Variable | Number | % |
|---|---|---|
| Age (years) | ||
| <55 | 607 | 24 |
| 55–65 | 727 | 29 |
| 65–75 | 708 | 28 |
| 75+ | 499 | 19 |
| Smoking status | ||
| Current smoker | 1169 | 46 |
| Ex-smoker | 487 | 19 |
| Never smoked | 839 | 33 |
| Unknown | 46 | 2 |
| Racial group | ||
| White | 1782 | 71 |
| South Asian | 688 | 27 |
| Other | 45 | 2 |
| Unknown | 26 | 1 |
| Diabetes | ||
| Yes | 567 | 22 |
| No | 1957 | 77 |
| Unknown | 17 | 1 |