Table 4.
Percent Increase in Patients with a Polyp, Adenoma or Serrated Polyp Detected and in Attributable Risk, Assuming a Minimum Mandated Normal Withdrawal Time (NWT)
| Assumed minimum NWT (minutes)1 |
Percent increase in patients with findings |
95% CI | Percent increase in attributable risk (AR)2 |
95% CI | p-value |
|---|---|---|---|---|---|
| Polyps | |||||
| 7 | 0.96 | (0.32, 2.23) | 2.02 | (0.69, 4.72) | 0.14 |
| 8 | 2.18 | (0.68, 3.68) | 4.59 | (1.42, 7.77) | 0.004 |
| 9 | 6.16 | (3.69, 8.62) | 12.97 | (7.77, 18.17) | <0.0001 |
| 10 | 4.19 | (2.18, 6.20) | 8.82 | (4.53, 13.12) | <0.0001 |
| Adenomas | |||||
| 7 | 0.72 | (0.13, 1.56) | 2.65 | (0.47, 5.77) | 0.10 |
| 8 | 1.53 | (0.62, 2.44) | 5.65 | (2.28, 9.02) | 0.001 |
| 9 | 3.79 | (1.80, 5.78) | 14.01 | (6.59, 21.42) | <0.0001 |
| 10 | 2.51 | (1.08, 3.94) | 9.27 | (4.06, 14.48) | 0.001 |
| Serrated Polyps | |||||
| 7 | 0.71 | (0.11, 1.31) | 8.51 | (1.17, 15.86) | 0.02 |
| 8 | 1.03 | (0.16, 1.91) | 12.40 | (2.48, 22.32) | 0.02 |
| 9 | 2.39 | (0.90, 3.87) | 28.59 | (12.40, 44.78) | 0.002 |
| 10 | 1.90 | (0.52, 3.28) | 22.75 | (6.30, 39.19) | 0.01 |
1
In this analysis, all NWTs below the ‘assumed minimum NWT’ were replaced with that assumed minimum, and the percentage increase in findings that would result was calculated
2
Attributable Risk represents the proportional increase in detection rate: the new estimated detection rate based on the assumed minimum NWT minus the baseline detection rate, divided by the baseline detection