Table 2

Distribution of CRC stages in the exposed and unexposed groups and interval cancer diagnosed within the study cohort

AJCC staging*Unexposed groupExposed group
Overall†Only attended first FIT screeningAttended subsequent FIT screening
N%N%N%N%
Overall
 020196.7483222.3202421.5154429.6
 I458715.1575326.6267728.5159130.5
 II731724.2358516.5159417.068013.1
 III881229.1496222.9219523.4103719.9
 IV756025.0253311.79109.73586.9
Total30 295100.021 665100.09400100.05210100.0
Distal
 015937.0366523.0162522.4115331.2
 I391917.1452428.4215229.7118032.0
 II517022.6234614.7111715.439810.8
 III674729.4369923.2171123.673419.9
 IV548723.9169910.76498.92256.1
Total22 916100.015 933100.07254100.03690100.0
Proximal
 04105.7116020.539718.638925.8
 I6388.9121121.452224.540927.1
 II207628.9120521.346922.027818.4
 III200628.0124922.148322.730019.9
 IV204528.582714.625912.21328.8
Total7175100.05652100.02130100.01508100.0
  • *Staging was based on AJCC sixth version before 2010 and seventh version thereafter. Stage information was incomplete in 10.8% in the screened group and 15.9% in unscreened group.

  • †Also includes FIT interval cancer, colonoscopy interval cancer and CRC of non-compliance with colonoscopy, in addition to CRC detected at first and subsequent screening rounds of next two columns.

  • AJCC, American Joint Committee on Cancer; CRC, colorectal cancer; FIT, faecal immunochemical test.