Phase 3 response rates according to participant characteristics
| Variable | Respondents n (%) | Non-respondents n (%) | P value | |
| Sex | Male | 346 (49.7) | 350 (50.3) | 0.342 |
| Female | 444 (47.3) | 494 (52.7) | ||
| Age | ≤54 | 142 (30.4) | 325 (69.6) | <0.001 |
| 55–64 | 191 (48.7) | 201 (51.3) | ||
| 65–74 | 271 (60.4) | 178 (39.6) | ||
| ≥75 | 181 (56.4) | 140 (43.6) | ||
| Procedure | OGD | 328 (45.6) | 392 (54.4) | <0.001 |
| Colonoscopy | 346 (54.3) | 291 (45.7) | ||
| CTC | 115 (55.0) | 94 (45.0) | ||
| OGD and colonoscopy | 10 (29.4) | 24 (70.6) | ||
| Site | A | 98 (43.9) | 125 (56.1) | 0.045 |
| B | 193 (53.8) | 166 (46.2) | ||
| C | 220 (50.1) | 219 (49.9) | ||
| D | 288 (45.7) | 342 (54.3) | ||
P value for χ² tests.
CTC, CT colonography; OGD, oesophagogastroduodenoscopy.