Table 2.
General characteristics of the study subjects n (%)
| Variable |
Male (n = 1875) |
P value1 |
Female (n = 894) |
P value1 | ||
| Case | Control | Case | Control | |||
| (n = 625) | (n = 1250) | (n = 298) | (n = 596) | |||
| Age group (yr) | 0.997 | 0.994 | ||||
| -49 | 128 (20.5) | 258 (20.6) | 82 (27.5) | 166 (27.9) | ||
| 50-59 | 227 (36.3) | 453 (36.2) | 111 (37.3) | 221 (37.1) | ||
| 60+ | 270 (43.2) | 539 (43.1) | 105 (35.2) | 209 (35.1) | ||
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | ||
| Marital status | < 0.001 | < 0.001 | ||||
| Married | 557 (89.1) | 1162 (93.0) | 216 (73.0) | 493 (83.4) | ||
| Single | 66 (10.6) | 72 (5.8) | 80 (27.0) | 98 (16.6) | ||
| Missing | 2 (0.3) | 16 (1.3) | 2 (0.7) | 5 (0.8) | ||
| Education level | < 0.001 | < 0.001 | ||||
| Under middle school | 183 (29.3) | 175 (14.0) | 138 (46.3) | 106 (18.1) | ||
| High school | 266 (42.6) | 329 (26.3) | 103 (34.6) | 258 (44.0) | ||
| College or more | 176 (28.2) | 712 (57.0) | 57 (19.1) | 223 (38.0) | ||
| Missing | 0 (0.0) | 34 (2.7) | 0 (0.0) | 9 (1.5) | ||
| Income (10000won/mo) | < 0.001 | < 0.001 | ||||
| < 200 | 222 (35.5) | 254 (20.3) | 99 (33.2) | 134 (25.0) | ||
| 200-400 | 253 (40.5) | 534 (42.7) | 134 (45.0) | 218 (40.7) | ||
| > 400 | 150 (24.0) | 363 (29.0) | 65 (21.8) | 184 (34.3) | ||
| Missing | 0 (0.0) | 99 (7.9) | 0 (0.0) | 60 (10.1) | ||
| Body mass index (kg/m2) | < 0.001 | 0.270 | ||||
| < 25 | 432 (69.1) | 734 (58.7) | 207 (69.5) | 435 (73.0) | ||
| ≥ 25 | 192 (30.7) | 516 (41.3) | 91 (30.5) | 161 (27.0) | ||
| Missing | 1 (0.2) | 0 (0.0) | 0 (0.0) | 0 (0.0) | ||
| Smoking status | 0.076 | < 0.001 | ||||
| Non-smoker | 145 (23.2) | 245 (19.6) | 264 (88.6) | 571 (95.8) | ||
| Ex-smoker | 303 (48.5) | 671 (53.7) | 15 (5.0) | 16 (2.7) | ||
| Current smoker | 177 (28.3) | 334 (26.7) | 19 (6.4) | 9 (1.5) | ||
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | ||
| Alcohol consumption | < 0.001 | 0.186 | ||||
| Non-drinker | 107 (17.1) | 199 (15.9) | 172 (57.7) | 362 (60.7) | ||
| Ex-drinker | 103 (16.5) | 136 (10.9) | 26 (8.7) | 33 (5.5) | ||
| Current drinker | 415 (66.4) | 915 (73.2) | 100 (33.6) | 201 (33.7) | ||
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | ||
| Regular exercise | < 0.001 | < 0.001 | ||||
| No | 387 (61.9) | 490 (39.2) | 225 (75.5) | 262 (44.0) | ||
| Yes | 238 (38.1) | 715 (57.2) | 73 (24.5) | 333 (56.0) | ||
| Missing | 0 (0.0) | 45 (3.6) | 0 (0.0) | 1 (0.2) | ||
| Family history of cancer | 0.002 | 0.141 | ||||
| No | 392 (62.7) | 686 (54.9) | 171 (57.4) | 311 (52.2) | ||
| Yes | 233 (37.3) | 560 (44.8) | 127 (42.6) | 285 (47.8) | ||
| Missing | 0 (0.0) | 4 (0.3) | 0 (0.0) | 0 (0.0) | ||
| Family history of colorectal cancer | < 0.001 | 0.926 | ||||
| No | 560 (89.6) | 1188 (95.0) | 277 (93.0) | 555 (93.1) | ||
| Yes | 65 (10.4) | 58 (4.6) | 21 (7.1) | 41 (6.9) | ||
| Missing | 0 (0.0) | 4 (0.3) | 0 (0.0) | 0 (0.0) | ||
1
P values were calculated by χ2 test.