| Barium enema, n (% area total) | CTC, n (% area total) | CT abdo, n (% area total) | Total | |
|---|---|---|---|---|
| London | 30 (20%) | 94 (64%) | 24 (16%) | 148 |
| Eastern | 17 (33%) | 28 (55%) | 6 (12%) | 51 |
| Southern | 5 (7%) | 55 (80%) | 9 (13%) | 69 |
| North-East | 30 (41%) | 38 (52%) | 5 (7%) | 73 |
| North-West | 8 (24%) | 19 (58%) | 6 (18%) | 33 |
| West-Middlands | 30 (47%) | 30 (47%) | 4 (6%) | 64 |
| Total | 120 | 264 | 54 | 438 |