Table 3

Standardised incidence ratio (SIR) of colorectal cancer after first adenoma removal according to colonoscopic follow-up

Advanced adenomasNon-advanced adenomas
Person-years at riskObserved casesSIR95% CIPerson-years at riskObserved casesSIR95% CI
Colonoscopic follow-up
 At least one colonoscopy*7588151.100.62 to 1.8212 328110.600.30 to 1.07
 No colonoscopy3259314.262.89 to 6.047362110.820.41 to 1.47
 Unknown133572.460.99 to 5.08373640.610.17 to 1.57
  • * Excluding the diagnosis colonoscopy for patients who developed a symptomatic colorectal cancer.

  • SIR, standardised incidence ratio.