Table 1.

Distributions of selected covariates by sex, case-control status, and province

Men
Women
Cases
Controls
Cases
Controls
ON (n = 871), %NL (n = 421), %ON (n = 1,040), %NL (n = 425), %ON (n = 1,132), %NL (n = 272), %ON (n = 910), %NL (n = 293), %
Age (y)
    18-290.90.70.30.70.50.00.60.0
    30-395.40.51.00.94.41.82.82.7
    40-4921.89.06.810.617.96.310.77.9
    50-5920.723.328.125.221.530.226.733.8
    60-6933.837.541.238.435.637.939.539.3
    70+1829232420242016
    P*0.130.12
University graduate288291518102115
    P*<0.00010.003
Household income ≥$30,000, 2 y ago5148535847385247
    P*0.0001<0.0001
Currently married or living as married8683868469686775
    P*0.880.01
Ever endoscopy screened for CRC77141378814
    P*0.560.006
Diabetes10221114718612
    P*0.0090.002
Hypercholesterolemia/triglyceridemia requiring medication1518212512181423
    P*0.360.0002
Regular NSAID use4141514442334646
    P*0.050.88
Regular bulk-forming laxative use157832012138
    P*0.0010.009
Regular multivitamin use3117351744234127
    P<0.000l0.0001
Regular calcium use9614844254840
    P*0.0030.02
Ever pregnant87898990
    P*0.54
Peri- or post-menopausal81938487
    P*0.14
Ever use of hormonal contraceptives§52425755
    P*0.42
Ever use of any form of postmenopausal hormones35264438
    P*0.22
Fruit >14 servings/wk, 2 y ago1310121025152424
    P*0.00060.31
Vegetables >14 servings/wk, 2 y ago1617151336223630
    P*0.00010.01
Red meat >5 servings/wk, 2 y ago2818221621171817
    P*0.0040.03
Average weekly recreational activity during 20s ≤3 MET-h2532273033433637
    P*0.330.38
Average alcoholic drinks during 20s >7/wk423836426273
    P*0.00010.0001
Nonsmoker?3519342951444950
    P*0.080.04
  • Abbreviations: ON, Ontario; NL, Newfoundland; CRC, colorectal cancer; MET, metabolic equivalent; NSAID, nonsteroidal anti-inflammatory drugs.

  • * P value of χ2 test between provincial control groups.

  • Physician diagnosed.

  • At least twice a week for longer than 1 mo.

  • § For 1 y or longer.

  • Did not smoke at least one cigarette a day for 3 mo or longer.