Table 3.
Regression analysis of effects of normal withdrawal time and patient characteristics on rates of polyp, adenoma, and serrated polyp detectionΩ
| Polyp Detection Rate | Adenoma Detection Rate | Serrated Polyp Detection Rate | ||||
|---|---|---|---|---|---|---|
| Characteristics | IRR | 95% CI | IRR | 95% CI | IRR | 95% CI |
| Exam Characteristics | ||||||
| Withdrawal time | ||||||
| 3–5 min | 1.21 | (0.95, 1.54) | 1.16 | (0.87, 1.56) | 0.87 | (0.53, 1.44) |
| 6 min | 1.00 | (−,−) | 1.00 | (−,−) | 1.00 | (−,−) |
| 7 min | 1.21 | (1.06, 1.38) | 1.23 | (1.01, 1.50) | 1.28 | (0.84, 1.97) |
| 8 min | 1.29 | (1.06, 1.55) | 1.32 | (1.06, 1.64) | 1.39 | (0.86, 2.26) |
| 9 min | 1.46 | (1.22, 1.75) | 1.50 | (1.21, 1.85) | 1.77 | (1.15, 2.72) |
| 10 min | 1.39 | (1.03, 1.87) | 1.41 | (1.03, 1.94) | 1.65 | (0.93, 2.93) |
| >10 min | 1.23 | (0.99, 1.54) | 1.23 | (0.95, 1.59) | 1.73 | (1.07, 2.78) |
| Patient Characteristics | ||||||
| Age at colonoscopy (years) | ||||||
| 40–49 | 1.00 | (−,−) | 1.00 | (−,−) | 1.00 | (−,−) |
| 50–59 | 1.04 | (0.91, 1.19) | 1.04 | (0.85, 1.27) | 1.04 | (0.71, 1.54) |
| 60–69 | 1.21 | (1.08, 1.37) | 1.34 | (1.08, 1.66) | 1.19 | (0.84, 1.69) |
| 70+ | 1.26 | (1.09, 1.45) | 1.53 | (1.22, 1.93) | 1.04 | (0.69, 1.58) |
| Female | 0.78 | (0.75, 0.81) | 0.63 | (0.58, 0.69) | 0.82 | (0.73, 0.92) |
| White | 0.99 | (0.86, 1.13) | 1.02 | (0.84, 1.23) | 0.91 | (0.64, 1.28) |
| Body Mass Index (kg/m2) | ||||||
| <25 (underweight & normal) | 1.00 | (−,−) | 1.00 | (−,−) | 1.00 | (−,−) |
| ≥25 to <30 (overweight) | 1.17 | (1.09, 1.25) | 1.14 | (1.04, 1.26) | 1.06 | (0.85, 1.33) |
| ≥30 to <35 (Obesity Class I) | 1.30 | (1.21, 1.39) | 1.29 | (1.15, 1.44) | 1.22 | (0.97, 1.53) |
| ≥35 (Obesity Classes II/ III) | 1.40 | (1.29, 1.52) | 1.41 | (1.25, 1.59) | 1.45 | (1.08, 1.95) |
| First colonoscopy | 0.96 | (0.92, 1.00) | 0.95 | (0.89, 1.02) | 0.97 | (0.83, 1.13) |
*
Adjusted for all characteristics listed in the table, as well as for ndoscopist estimated volume, age, gender, and subspecialty.
IRR = Incidence Rate Ratio, 95% CI = 95% Confidence Interval.
Ω
Serrated polyps include any serrated adenoma or sessile serrated polyp or hyperplastic polyps found proximal to the sigmoid.