Table 1.

Characteristics of returning and non-returning subjects in the ACF study

Returned for year 1 exam (n = 434)Did not return (n = 71)P*
Age ≥ 7053%68%0.02
Current or former smoker55%73%0.005
Family history of colorectal cancer13%7%0.18
Daily aspirin use at year 046%49%0.61
Daily aspirin use at year 147%
Adenoma status at PLCO baseline exam0.48
Mean time lag from PLCO baseline exam to year 0 ACF exam (y)
  • *Comparison between those who did and those who did not return.

  • At baseline exam (year 0).