Table 1 Characteristics of colorectal cancer cases and controls from National Cancer Center in Korea, 2010–2013
From: Effects of interactions between common genetic variants and smoking on colorectal cancer
Characteristics | Men | Women | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Case | Control | P a | Case | Control | P a | |||||
(N = 480) | (N = 960) | (N = 223) | (N = 446) | |||||||
N | (%) | N | (%) | N | (%) | N | (%) | |||
Age (years), mean (SD) | 57.0 | (9.3) | 56.5 | (8.9) | 0.34 | 55.1 | (9.8) | 54.8 | (9.4) | 0.68 |
Family history of colorectal cancerb |  |  |  |  | < 0.01 |  |  |  |  | 0.21 |
 no | 439 | (91.5) | 919 | (95.7) |  | 215 | (96.4) | 420 | (94.2) |  |
 yes | 41 | (8.5) | 41 | (4.3) |  | 8 | (3.6) | 26 | (5.8) |  |
BMI (kg/m2), mean (SD) | 23.7 | (3.0) | 24.4 | (2.6) | < 0.01 | 23.8 | (4.2) | 23.2 | (2.8) | 0.10 |
Education level |  |  |  |  | < 0.01 |  |  |  |  | < 0.01 |
  ≤ middle school | 151 | (31.5) | 128 | (13.3) |  | 104 | (46.6) | 69 | (15.5) |  |
  ≤ high school | 194 | (40.4) | 260 | (27.1) |  | 75 | (33.6) | 197 | (44.2) |  |
  ≥ college or university | 135 | (28.1) | 562 | (58.5) |  | 44 | (19.7) | 179 | (40.1) |  |
Alcohol drinking | Â | Â | Â | Â | 0.19 | Â | Â | Â | Â | 0.24 |
 never | 88 | (18.3) | 150 | (15.6) |  | 124 | (55.6) | 269 | (60.3) |  |
 ever | 392 | (81.7) | 810 | (84.4) |  | 99 | (44.4) | 177 | (39.7) |  |
Smoking |  |  |  |  | 0.06 |  |  |  |  | < 0.01 |
 never | 116 | (24.2) | 191 | (19.9) |  | 200 | (89.7) | 426 | (95.5) |  |
 ever | 364 | (75.8) | 769 | (80.1) |  | 23 | (10.3) | 20 | (4.5) |  |