Table 4: Factors associated with clinically diagnosed CRC among individuals who ever participated in the screening program for CRC (≤30 months versus >30 months since their last screening).

Interval CRC ≤30 months Clinically diagnosed CRC >30 months
ORa95% CIORa95% CI

Gender
 Men11
 Women1.02(0.442.33)1.94(0.695.43)
Age at diagnosis*1.03(0.961.11)1.38(1.241.53)
Number of screens1.24(0.851.81)0.55(0.320.94)
Tumor site
 Distal11
 Proximal 1.32(0.513.39)3.73(1.2111.51)
 Rectum3.66(1.518.88)3.48(1.0211.87)
Tumor stage
 I11
 II2.63(0.868.04)2.21(0.618.07)
 III3.45(1.398.30)1.66(0.515.43)
 IV2.80(0.7310.76)4.86(1.0223.24)

ORa adjusted odds ratios derived from multivariate logistic regression models. Analysis was restricted to those individuals with a negative result in their last screening that have been diagnosed with CRC later on and those who were diagnosed during the screening process. *Age at diagnosis was considered as a continuous variable; the age range was 50–73 years for individuals with a CRC diagnosed within 30 months after their screening and 55–80 years for individuals who ever participated in the screening program and were diagnosed with CRC.