Association between receipt of screening endoscopy and colorectal adenocarcinoma death risk
| Screening colonoscopy status according to colon location | Estimated relative risks (95% CI) | |||
|---|---|---|---|---|
| Case patients, n=1747 | Matched control patients, n=3460 | Bivariate model | Multivariate model* | |
| All locations in the colon/rectum | ||||
| No screening endoscopy | 1358 | 2310 | 1.00 | 1.00 |
| Screening colonoscopy | 24 | 120 | 0.33 (0.21 to 0.52) | 0.33 (0.21 to 0.52) |
| Screening sigmoidoscopy | 365 | 1030 | 0.60 (0.52 to 0.69) | 0.64 (0.56 to 0.75) |
| Right colon | ||||
| No screening endoscopy | 649 | 1151 | 1.00 | 1.00 |
| Screening colonoscopy | 13 | 61 | 0.37 (0.20 to 0.68) | 0.35 (0.18 to 0.65) |
| Screening sigmoidoscopy | 218 | 535 | 0.72 (0.59 to 0.87) | 0.75 (0.62 to 0.92) |
| Left colon/rectum | ||||
| No screening endoscopy | 669 | 1092 | 1.00 | 1.00 |
| Screening colonoscopy | 9 | 56 | 0.25 (0.12 to 0.50) | 0.25 (0.12 to 0.53) |
| Screening sigmoidoscopy | 138 | 468 | 0.48 (0.38 to 0.59) | 0.52 (0.41 to 0.66) |
*The multivariate model adjusted for race/ethnicity, family history, percentage of people 25+ years in the census tract with at least a high-school diploma, Charlson comorbidity score and number of primary care visits, as well as an indicator faecal occult blood testing. The estimates were obtained from conditional regression models.