| Before | After | |||||
|---|---|---|---|---|---|---|
| Quartile | N | ADR (%) | N | ADR (%) | Difference ratio | p value ADR |
| Upper | 785 | 27.4 | 2508 | 21.5 | 0.78 | <0.001 |
| Upper middle | 1116 | 17.5 | 3119 | 19.2 | 1.10 | 0.20 |
| Lower middle | 785 | 13.3 | 2539 | 19.3 | 1.45 | <0.001 |
| Lower | 936 | 7.3 | 2405 | 13.9 | 1.90 | <0.001 |
N = number of colonoscopies