Table 1.

Distribution of baseline risk factors for colorectal cancer by category of fish intake at 12 months

VariableAverage frequency of fish intake (times per week)
<11 to <22 to <5≥5
Number of men2,0606,65610,3502,343
Age at randomization54.0 ± 10.2*53.6 ± 9.653.6 ± 9.453.4 ± 9.2
Smoking status (%)
    Never54.049.148.651.7
    Past33.638.441.140.2
    Current12.412.510.38.1
Multivitamin use (%)
    Never64.365.164.761.0
    Past16.316.615.415.7
    Current19.418.319.923.4
Diabetes (%)3.12.32.22.4
Aspirin assignment (%)51.249.250.449.5
Vigorous exercise (%)
    <1 time per wk31.829.725.824.1
    1-4 times per wk52.754.858.056.9
    ≥5 times per wk15.515.516.119.1
Alcohol intake (%)
    ≤1 time per wk53.442.136.336.8
    2-6 times per wk26.934.037.738.7
    ≥1 drink per day19.723.926.124.5
BMI24.6 ± 2.724.8 ± 2.824.8 ± 2.824.7 ± 2.8
  • * Plus-minus values are means ± SD.

  • Vigorous exercise defined as “exercise vigorous enough to work up a sweat.”

  • BMI is equal to the weight in kilograms divided by the square of the height in meters.