Research Article

Interval Colorectal Cancers following Guaiac Fecal Occult Blood Testing in the Ontario ColonCancerCheck Program

Table 2

Subsequent gFOBT screen 21–30 months after baseline normal gFOBT result.

MalesFemales

Total subsequent gFOBT screen participants 44,362/101,526 (43.70%)57,164/101,526 (56.30%)
 Normal result42,290/44,362 (95.33%)55,393/57,164 (96.90%)
 Positive result2,072/44,362 (4.67%)1,771/57,164 (3.10%)

Results by age strata
 50–54 years
  Normal result11,347/11,924 (95.16%)16,391/16,867 (97.18%)
  Positive result577/11,924 (4.84%)476/16,867 (2.82%)
 55–59 years
  Normal result9,705/10,140 (95.71%)12,689/13,072 (97.07%)
  Positive result435/10,140 (4.29%)383/13,072 (2.93%)
 60–64 years
  Normal result9,497/9,937 (95.57%)12,057/12,461 (96.76%)
  Positive result440/9,937 (4.43%)404/12,461 (3.24%)
 65–69 years
  Normal result8,024/8,443 (95.04%)9,804/10,147 (96.62%)
  Positive result419/8,443 (4.96%)343/10,147 (3.38%)
 70–74 years
  Normal result3,717/3,918 (94.87%)4,452/4,617 (96.43%)
  Positive result201/3,918 (5.13%)165/4,617 (3.57%)

Difference in percent positive results between males and females in all age strata, , except ages 70–74, .