Characteristics of included patients (N=218 304)
| Mean/n | SD/% | |
| Female gender | 121 107 | 55.5 |
| Age group (years) | ||
| 0–14 | 36 371 | 16.7 |
| 15–24 | 23 020 | 10.5 |
| 25–44 | 55 316 | 25.3 |
| 45–64 | 57 000 | 26.1 |
| 65–74 | 24 086 | 11.0 |
| 75+ | 22 511 | 10.3 |
| Smoking status | ||
| Non-smoker | 82 327 | 37.7 |
| Current smoker | 37 286 | 17.1 |
| Ex-smoker | 40 834 | 18.7 |
| Unknown | 57 857 | 26.5 |
| IMD | ||
| First quintile (least deprived) | 48 363 | 22.2 |
| Second quintile | 47 948 | 22.0 |
| Third quintile | 41 825 | 19.2 |
| Fourth quintile | 41 953 | 19.2 |
| Fifth quintile (most deprived) | 34 750 | 15.9 |
| Unknown | 3465 | 1.6 |
| Ethnic group | ||
| White | 118 063 | 54.1 |
| Asian | 6008 | 2.8 |
| Chinese | 491 | 0.2 |
| Black | 3908 | 1.8 |
| Mixed/other | 4374 | 2.0 |
| Unknown | 85 460 | 39.2 |
IMD, index of multiple deprivation.