Impact of NICE guidelines
| Diagnostic yield of CRC | Diagnostic yield of IBD | Overall diagnostic yield | OR | |
| CRC NICE criteria positive (n=592) | 3% (n=17) | n/a | n/a | 7.71 (95% CI 1.77 to 33.56, p=0.0064) |
| CRC NICE criteria negative (n=524) | 0.4% (n=2) | n/a | n/a | |
| IBD NICE criteria positive (n=517) | n/a | 9% (n=48) | n/a | 3.5 (95% CI 1.99 to 6.17, p<0.0001) |
| IBD NICE criteria negative | n/a | 2.8% (n=17) | n/a | |
| CRC +IBD NICE criteria positive (n=899) | n/a | n/a | 15% (n=133) | 1.44 (95% CI 0.919 to 2.278, p=0.11) |
| CRC +IBD NICE criteria negative (n=217) | n/a | n/a | 13% (n=28) |
CRC, colorectal cancer; IBD, inflammatory bowel disease; n/a, not applicable; NICE, National Institute for Health and Care Excellence.