Skip to main content

Table 1 Distributions of age, gender, cigarette smoking and alcohol consumption among controls and cases with colorectal carcinomas and adenomas.

From: Polymorphisms of the XRCC1, XRCC3 and XPDgenes and risk of colorectal adenoma and carcinoma, in a Norwegian cohort: a case control study

  Controls Carcinomas Adenomas, all High-risk adenomas Low-risk adenomas
  No (%) No (%) No (%) No (%) No (%)
No. of subjects 399 157 983 227 756
Gender a
Male 157 (39.3) 87 (55.4) 603 (61.3) 150 (66.1) 453 (59.9)
Female 242 (60.7) 70 (44.6) 380 (38.7) 77 (33.9) 303 (40.1)
Age b
Mean (SD) 54.2 (3.3) 67.9 (11.2) 57.3 (3.7) 57.3 (3.5) 57.3 (3.8)
Smoking status *
Never smoked 155 (46.7) 33(31.1) 253 (30.6) 51 (27.0) 202 (31.7)
Ever smoked 177 (53.3) 73 (68.9) 574 (69.4) 138 (73.0) 436 (68.3)
Mean no. of cigarette years (SD) 249(229) 383(339) 360(263) 389(244) 351(269)
Alcohol consumption *
< 1 unit/month 72 (21.7) 36 (34.0) 180 (21.8) 43 (22.8) 137 (21.5)
≥ 1 unit/month 260 (78.3) 70 (66.0) 647 (78.2) 146 (77.2) 501 (78.5)
Mean units of alcohol per month (SD) 11.1 (12.2) 15.5 (22.3) 16.4 (22.9) 18.4 (29.8) 15.8 (20.4)
  1. * Missing values for cigarette smoking and alcohol consumption gave rise to diminished number of cases and controls.
  2. a There are significant differences in the number of males and females in the control group and the case groups, p < 10-4 (test for comparison of two proportions).
  3. b There are significant differences in age among the control group and the case groups, p < 10-4 (Mann-Whitney test).