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Table 1 Description of cancer cases and controls and their potential as risk factors for colon cancer.

From: Colon cancer risk and different HRT formulations: a case-control study

   No. cases1 No. controls1 Adj. OR (95% CI)
Age (continuous) per year 354 1422 1.64 (1.52–1.77)
Age < 50 years 47 249 referent
  50+ years 307 1173 4.38 (1.41–13.62)
Education Lower education 279 1014 referent
  University level 64 394 0.64 (0.45–0.91)
Age at menarche (cont) per year 344 1396 1.04 (0.95–1.14)
Age at menarche < 13 years 148 683 referent
  13+ years 196 713 1.16 (0.87–1.55)
Pregnancy Never pregnant 32 104 referent
  Ever pregnant 318 1300 0.85 (0.50–1.45)
Number of children (cont) per child 318 1286 0.75 (0.64–0.89)
Age at first live birth (cont) per birth 316 1274 1.00 (0.96–1.04)
Age at first live birth < = 22 years 140 624 referent
  > 22 years 176 650 1.15 (0.84–1.57)
Breast-feeding never 193 525 referent
  ever 157 878 0.31 (0.23–0.43)
OC use never 144 484 referent
  ever 210 933 0.64 (0.46–0.89)
Family history of colon cancer No 192 656 referent
  Yes 68 54 3.40 (2.08–5.56)
BMI (cont)   348 1406 0.96 (0.93–0.99)
Body mass index < 25 135 505 referent
  25+ 213 901 0.91 (0.68–1.23)
  1. 1 Differences in numbers of cases/controls across variables are due to missing information
  2. Conditional logistic regression: Age-adjusted odds ratios (OR) and 95% confidence intervals (CI).