Table 2.

Characteristics of the study population

CharacteristicCases (n = 244)Controls (n = 231)P*
Females (%)22.536.40.0009
Age (y)60 (55.5-74.5)57 (43-71)0.07
Non-White (%)11.19.10.48
Body mass index (kg/m2)26.5 (21.9-31.2)25.8 (21.1-30.5)0.04
Smoking status
    Current smoker (%)11.14.80.01
    Regular smoker (y)26 (6-46)18 (0-36)0.0001
    Cigarettes per day20 (0.8-39.2)20 (0-40)0.012
NSAID use (%)51.665.40.002
Family history of colon cancer (%)16.811.90.13
  • NOTE: All values are medians (interquartile range) unless otherwise indicated.

  • * Ps derived from the Wilcoxon signed rank sum test unless otherwise indicated.

  • P derived from the χ2 test.

  • Denotes regular use of aspirin or other NSAIDs.