Table 1.
Characteristics of study groups
| Intervention group (n=12 807) | Control group (n=13 247) | |
|---|---|---|
| Screen status | ||
| Prevalent | 6300 (49%) | 6517 (49%) |
| Incident | 6507 (51%) | 6730 (51%) |
| Age (years) | ||
| 50–59 | 7484 (58%) | 7842 (59%) |
| 60–70 | 5323 (42%) | 5405 (41%) |
| Median (IQR) | 58 (53–64) | 58 (53–63) |
| IMD quintile* | ||
| 1 | 3395 (27%) | 3623 (27%) |
| 2 | 3645 (28%) | 3703 (28%) |
| 3 | 2864 (22%) | 2978 (22%) |
| 4 | 1946 (15%) | 2028 (15%) |
| 5 | 939 (7%) | 891 (7%) |
| Missing | 18 (<1%) | 24 (<1%) |
| Site | ||
| Derby | 2398 (19%) | 2355 (18%) |
| Hull | 2120 (17%) | 2233 (17%) |
| Plymouth | 2456 (19%) | 2611 (20%) |
| Southeast London | 1595 (12%) | 1638 (12%) |
| Sheffield | 1207 (9%) | 1185 (9%) |
| West London | 3031 (24%) | 3225 (24%) |
Data are n (%) unless otherwise stated.
*
2010 Index of Multiple Deprivation (IMD) from most deprived to most affluent.