Table 1. Background characteristics of cases and controls by sex.
| Males | Females | |||||||||||
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| Controls | Cases | Controls | Cases | |||||||||
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| Colon | Rectum | Colon | Rectum | |||||||||
| N=118 | N=42 | N=41 | N=123 | N=30 | N=29 | |||||||
| Number (%) of | ||||||||||||
| Age in years | ||||||||||||
| <40 | 2 | (1.7) | 3 | (7.1) | 0 | (0) | 0 | (0) | 2 | (6.7) | 2 | (6.9) |
| 40-49 | 21 | (17.8) | 7 | (16.7) | 6 | (14.6) | 23 | (18.7) | 2 | (6.7) | 5 | (17.2) |
| 50-59 | 34 | (28.8) | 12 | (28.6) | 16 | (39.0) | 56 | (45.5) | 12 | (40.0) | 9 | (31.0) |
| 60-69 | 61 | (51.7) | 12 | (28.6) | 15 | (36.6) | 44 | (35.8) | 8 | (26.7) | 10 | (34.5) |
| >70 | 0 | (0) | 8 | (19.1) | 4 | (9.8) | 0 | (0) | 6 | (20.0) | 3 | (10.3) |
| Years from diagnosis | ||||||||||||
| ≤ 3 year | - | 26 | (61.9) | 30 | (73.2) | - | 21 | (70.0) | 24 | (82.8) | ||
| > 3 year | - | 16 | (38.1) | 11 | (26.8) | 9 | (30.0) | 5 | (17.2) | |||
| Smoking status | ||||||||||||
| Never | 34 | (28.8) | 14 | (33.3) | 4 | (9.8) | 106 | (86.2) | 27 | (90.0) | 26 | (89.7) |
| Former | 38 | (32.2) | 18 | (42.9) | 18 | (43.9) | 5 | (4.1) | 1 | (3.3) | 0 | (0.0) |
| Current | 46 | (39.0) | 10 | (23.8) | 19 | (46.3) | 12 | (9.8) | 2 | (6.7) | 3 | (10.3) |
| Drinking status | ||||||||||||
| Low (< 1 time /week) | 35 | (29.7) | 9 | (21.4) | 6 | (14.6) | 101 | (82.1) | 26 | (86.7) | 23 | (79.3) |
| Moderate*1 | 50 | (42.3) | 17 | (40.5) | 12 | (29.3) | 17 | (13.8) | 3 | (10.0) | 5 | (17.2) |
| 1-4 times /week | 22 | 8 | 3 | 12 | 1 | 3 | ||||||
| ≥ 5 times /week | 28 | 9 | 9 | 5 | 2 | 2 | ||||||
| High*1 | 33 | (28.0) | 16 | (38.1) | 23 | (56.1) | 4 | (3.3) | 1 | (3.3) | 1 | (3.5) |
| 1-4 times /week | 8 | 3 | 1 | 3 | 0 | 1 | ||||||
| ≥ 5 times /week | 25 | 13 | 22 | 1 | 1 | 0 | ||||||
| Unknown | 0 | (0) | 0 | (0) | 0 | (0) | 1 | (0.8) | 0 | (0) | 0 | (0) |
*1 ‘Moderate’ indicates once per week or more frequently with less than 50 mL of ethanol and ‘High’ indicates once per week or more frequently with more than 50 mL.