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 |