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Table 2 Baseline characteristics (mean or %) among colorectal cancer cases and control subjects of Caucasians from the Women's Health Initiative Observational Cohort

From: Estrogen and progesterone-related gene variants and colorectal cancer risk in women

Characteristics Cases (N = 427) Controls (N = 871) P value
Age, year 66.6 66.6 Matched
Body mass index, kg/m2 27.9 26.9 0.001
Family history of colorectal cancer, % 18.7 14.8 0.07
Colonoscopy/sigmoidoscopy exam, % 50.0 57.6 0.01
History of colorectal polyps, % 20.0 19.5 0.89
Hysterectomy, % 35.4 34.9 Matched
Current smoking, % 11.2 10.6 0.82
Current use of E-alone therapy, % 19.7 24.0 0.06
Current use of E+P therapy, % 15.7 21.2 0.06
Physical activity, MET/week 12.4 14.4 0.009
Alcohol intake, drink/day    0.07
never/past 22.2 26.0  
<1 38.9 30.8  
≥1 38.9 43.2  
Total calorie intake, g/day 1437 1556 0.001
Tumor location    
colon, N 338 N/A  
rectum, N 58 N/A  
Tumor stage    
Localized, N 183 N/A  
Regional, N 152 N/A  
Distant, N 61 N/A