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