Table 1.

Characteristics of study participants by comparison groups, the TCPS, 2003-2005

CharacteristicPolyp type
Adenomatous only (n = 557)Hyperplastic only (n = 250)Concurrent adenomatous and hyperplastic (n = 195)Controls (n = 1,493)P*
Age (y), mean ± SD59.6 ± 7.556.7 ± 7.059.8 ± 6.457.2 ± 7.8<0.001
Sex (male), %75.069.883.658.1<0.001
Educational attainment (college or higher), %70.561.963.273.00.001
Race (White), %83.792.089.786.20.007
Indication for colonoscopy (screening), %56.154.244.556.20.012
Family history of colorectal cancer, %13.512.418.612.30.439
Ever smoke cigarettes regularly, %58.172.182.352.3<0.001
Ever consume alcohol regularly, %47.652.945.344.90.100
Exercise regularly, %51.350.847.156.30.032
Current NSAID user, %50.857.354.357.40.074
BMI (kg/m2), mean ± SE
    Male28.9 ± 0.528.4 ± 0.828.9 ± 0.928.2 ± 0.40.119
    Female27.4 ± 1.128.1 ± 1.427.2 ± 2.227.6 ± 0.60.743
Height (cm), mean ± SE
    Male179.5 ± 0.7176.8 ± 1.0179.9 ± 1.1178.6 ± 0.50.031
    Female163.7 ± 1.1163.9 ± 1.5165.3 ± 2.3163.7 ± 0.60.743
  • * Derived from ANOVA for continuous variables and χ2 test for categorical variables.

  • Standardized by age (40-49, 50-59, 60-64, and ≥65 y) and sex distribution of all study participants.

  • Standardized by age distribution (40-49, 50-59, 60-64, and ≥65 y) of all study participants.