Table 2 Summaries of binary or discrete covariates in real CRC data

Gender

54 % male, 46 % female

Recent aspirin/NSAID use

64 % no, 36 % yes

Recent smoker

83 % no, 17 % yes

(among women) menopause

12 % pre, 88 % post

(among post-menopausal women)

taking HRT within 2 years

30 % yes, 70 % no

Data collection center

79 % Kaiser, 21 % Utah

Race

81.6 % White, 8.5 % Hispanic,

7.6 % Black, 2.1 % other

Smoking status

13 % current, 45 % former,

42 % never

Long-term alcohol consumption

38 % none, 35 % moderate,

27 % high

SEER summary stage

1 % in situ, 34 % localized, 52 %

regional, 12 % distant, 1 % unknown

AJCC severity stage

1 % 0 (in situ), 26 % 1, 31 % 2, 30 % 3,

12 % 4 (distant)

Colon or rectal cancer

76 % colon, 24 % rectal