Table 1.

Selected characteristics of subjects in a nested case-control study of advanced colorectal adenoma in the PLCO Cancer Screening Trial

Case, n = 772*
Control, n = 777*
Pχ2
n(%)n(%)
Matching factors
Gender
    Male535(69.3)536(69.0)0.9
    Female237(30.7)241(31.0)
Race
    White725(93.9)729(93.8)1.0
    Black22(2.9)23(3.0)
    Other25(3.2)25(3.2)
Other factors
Age (years)
    55-59257(33.3)363(46.7)<0.0001
    60-64244(31.6)200(25.7)
    65-69172(22.3)140(18.0)
    70-7499(12.8)74(9.5)
First-degree family history of colorectal cancer
    Yes97(12.6)70(9.0)0.02
    No675(87.4)707(91.0)
Education
    <12 years72(9.3)50(6.4)0.001
    12 years/high school equivalent191(24.7)176(22.7)
    Some college276(35.8)247(31.8)
    College and above232(30.1)303(39.0)
Body mass index at interview
    <18.55(0.7)2(0.3)0.3
    ≥18.5-<25200(25.9)219(28.2)
    ≥25-<30349(45.2)357(46.0)
    ≥30215(27.9)188(24.2)
Center
    Colorado71(9.2)89(11.5)<0.0001
    Georgetown36(4.7)45(5.8)
    Hawaii15(1.9)14(1.8)
    Henry Ford Health System78(10.1)107(13.8)
    Minnesota136(17.6)174(22.4)
    Washington77(10.0)75(9.7)
    Pittsburgh124(16.1)59(7.6)
    Utah69(8.9)41(5.3)
    Marshfield135(17.5)156(20.1)
    Alabama31(4.0)17(2.2)
  • * Numbers do not add up to the total because of missing values.

  • Hispanic (0.9percnt;), Asian (1.7percnt;), Pacific islander (0.4percnt;), and American Indian native (0.3percnt;).