Table 1

Selected characteristics of patients in the Minnesota Cancer Prevention Research Unit Polyp Study

CharacteristicAdenomatous polyps (n = 527)Hyperplastic polyps (n = 200)Controls (n = 633)
% male62.256.538.5
Age (yr)58.1 ± 9.753.8 ± 10.052.7 ± 10.9
Ethnic origin (% white)97.797.096.8
Cigarette smoking
 % never-smokers33.222.047.7
 % current smokers21.130.515.5
 % ex-smokers45.747.536.8
 Pack-years (mean ± SD)19.5 ± 23.421.2 ± 22.312.9 ± 21.9
% alcohol users73.479.471.7
% post-menopausal (women)84.472.468.7
% HRTa users (women)40.641.450.6
% NSAID users15.120.423.5
% family history of colorectal cancer16.620.727.3
Primary indication for colonoscopy
 % bleeding38.434.951.1
 % diagnostic7.88.516.5
 % follow-up5.811.65.5
 % positive family history7.614.821.8
 % screening39.228.63.2
 % other1.21.61.8
NAT2-imputed phenotype
 % fast6.15.06.6
 % intermediate37.239.034.5
 % slow56.756.058.9
  • a HRT, hormone replacement therapy; NSAID, nonsteroidal anti-inflammatory drug.