Number needed to scope (NNS) to detect one cancer and number of missed cancers (NMC) per 1000 faecal immunochemical tests (FITs) at various thresholds of FIT17
| Threshold (µg Hb/g faeces) | Positive FITs n (%) | Negative FITs n (%) | Cancers detected n (%) | NNS to detect one cancer | NMC per 1000 FITs |
| ≥7 | 111 (11) | 889 (89) | 10 (91) | 11 | 1 |
| ≥10 | 96 (10) | 904 (90) | 10 (91) | 10 | 1 |
| ≥20 | 71 (7) | 929 (93) | 9 (85) | 8 | 2 |
| ≥50 | 44 (4) | 956 (96) | 8 (74) | 6 | 3 |
| ≥100 | 30 (3) | 970 (97) | 7 (61) | 5 | 4 |
| ≥120 | 28 (3) | 972 (97) | 6 (57) | 5 | 5 |
| ≥150 | 25 (2) | 975 (98) | 6 (54) | 4 | 5 |