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. Author manuscript; available in PMC: 2013 Oct 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2012 Aug 21;21(10):1722–1730. doi: 10.1158/1055-9965.EPI-12-0561

Table 3. Follow-up Information for Individuals with a Negative FOBT.

Individuals with less than one year of follow-up contributed information only if diagnosed with CRC within one year of a negative FOBT.

Year of index FOBT test
1997–1999 (n=12,647) 2000–2002 (n=9,562) 2003–2005 (n=7,304) 2006–2010 (n=9,708)
Follow-up time, year
  Mean (SD) 3.4 (2.7) 3.2 (2.3) 2.9 (1.7) 1.6 (1.0)
  <1, % 10.5 11.8 12.3 32.5
  1 – <2, % 25.7 24.7 25.1 40.6
  2 – <3, % 23.4 23.3 23.8 16.8
  3 – <4, % 13.0 12.5 14.6 6.8
  4+, % 27.4 27.7 24.2 3.3
Reason end follow-up, %
 CRC diagnosis 0.2 0.1 0.1 0.1
 FOBT, Flexible Sigmoidoscopy, or Barium Enema 66.8 60.2 53.6 29.8
 Colonoscopy 6.7 11.1 17.8 10.7
 Non-CRC cancer or resection 2.8 2.1 1.8 0.9
 Disenrollment 20.5 21.7 18.8 9.7
 Death 1.2 0.9 0.6 0.2
 End of follow-up 1.8 3.9 7.3 48.6