Initial symptoms in the symptomatic group and screening methods in the asymptomatic group
| Initial symptom in the symptomatic group (n=145) | |
| Bloody stool | 56 |
| Abdominal pain | 27 |
| Abdominal distension | 8 |
| Nausea | 3 |
| Diarrhoea | 8 |
| Constipation | 20 |
| Narrow-calibre stool | 4 |
| Anal pain | 1 |
| Anal tumour palpation | 2 |
| Weight loss | 4 |
| Fatigue | 10 |
| Pneumaturia | 1 |
| Bone pain | 1 |
| Screening methods in the asymptomatic group (n=123) | |
| Faecal occult blood testing | 72 |
| Colonoscopy | 17 |
| CT scan | 12 |
| Positron emission tomography scan | 3 |
| Anaemia | 13 |
| High serum tumour marker level | 6 |