| Symptom item | Sensitivity (95% CI) | Specificity (95% CI) | Positive likelihood ratio (95%CI) | Negative likelihood ratio (95% CI) |
| Rectal bleeding | 64% (55% to 73%) | 52% (42% to 63%) | 1.32 (1.19 to 1.47) | 0.76 (0.66 to 0.87) |
| Change in bowel habit | 41% (23% to 60%) | 69% (58% to 78%) | 1.29 (1.05 to 1.59) | 0.82 (0.66 to 1.01) |
| Anaemia | 17% (5.5% to 33%) | 90% (87% to 92%) | 1.43 (0.75 to 2.74) | 0.96 (0.8 to 1.06) |
| Weight loss | 22% (14% to 31%) | 89% (81% to 95%) | 1.96 (1.25 to 3.08) | 0.91 (0.84 to 0.98) |
| Diarrhoea | 19% (1% to 54%) | 80% (63% to 93%) | 0.74 (0.34 to 1.62) | 0.98 (0.85 to 1.13) |
| Iron deficiency anaemia | 23% (2% to 57%) | 87% (83% to 91%) | 1.38 (0.48 to 3.94) | 0.88 (0.68 to 1.13) |
| Abdominal mass | 5% (2% to 9%) | 97% (96% to 98%) | 1.47 (0.68 to 3.19) | 0.99 (0.95 to 1.02) |
| Dark red rectal bleeding | 15% (3% to 34%) | 96% (93% to 98%) | 3.83 (2.62 to 5.61) | 0.88 (0.75 to 1.04) |
| Statistical models | 90% (84% to 95%) | 59% (52% to 66%) | 2.35 (2.16 to 2.55) | 0.15 (0.08 to 0.26) |
CI, confidence interval.