Baseline demographics
| Group 1 | Group 2 | |
| Total no | 1081 | 1059 |
| Female (%) | 646 (59.8) | 604 (57) |
| Median age (IQR), years | 53 (39–67) | 52 (37–67) |
| Region (N (%)) | ||
| Northwest London | 296 (27.38) | 293 (27.67) |
| North Central London | 198 (18.32) | 190 (17.94) |
| Northeast London | 88 (8.14) | 81 (7.65) |
| South London and Kent, Surrey, Sussex | 499 (46.16) | 495 (46.74) |
| Centre (N (%)) | ||
| Tertiary | 486 (45) | 474 (44.76) |
| Non-tertiary | 595 (55) | 585 (55.24) |
Demographics of the patients and comparison of the distribution of patients by regionand hospital type (teriary and non-tertiary).