Association between distance to closest colonoscopist and colonoscopy utilisation
| Distance, km | N (%) | Unadjusted colonoscopy utilisation rate, per 1000 residents | Adjusted RR (95% CI)* of colonoscopy utilisation |
| <10 | 7 191 023 (73.1) | 43.9 | 1.00 |
| 10 to <50 | 2 069 534 (21.0) | 45.8 | 1.03 (1.02 to 1.03) |
| 50 to <200 | 443 824 (4.5) | 38.0 | 0.96 (0.94 to 0.97) |
| ≥200 | 133 505 (1.4) | 28.8 | 0.89 (0.86 to 0.92) |
| Overall | 9 837 886 | 43.8 |
*Adjusted for age and sex.
RR, rate ratio.