Table 2

Association between receipt of screening endoscopy and colorectal adenocarcinoma death risk

Screening colonoscopy status according to colon locationEstimated relative risks (95% CI)
Case patients, n=1747Matched control patients, n=3460Bivariate modelMultivariate model*
All locations in the colon/rectum
 No screening endoscopy135823101.001.00
 Screening colonoscopy241200.33 (0.21 to 0.52)0.33 (0.21 to 0.52)
 Screening sigmoidoscopy36510300.60 (0.52 to 0.69)0.64 (0.56 to 0.75)
Right colon
 No screening endoscopy64911511.001.00
 Screening colonoscopy13610.37 (0.20 to 0.68)0.35 (0.18 to 0.65)
 Screening sigmoidoscopy2185350.72 (0.59 to 0.87)0.75 (0.62 to 0.92)
Left colon/rectum
 No screening endoscopy66910921.001.00
 Screening colonoscopy9560.25 (0.12 to 0.50)0.25 (0.12 to 0.53)
 Screening sigmoidoscopy1384680.48 (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.