Table 1.

Prospective Studies on the Impact of Sigmoidoscopy or Colonoscopy on Colorectal Cancer (CRC) Incidence and Mortality

^*Reduction in CRC mortality and all-cause mortality was statistically significant for the screened group in per-protocol analysis but not in intention-to-treat analysis.

RCT, Randomized controlled trial; SEER, Surveillance, Epidemiology, and End Results; Δ, change; NA, not available.