1.
Characteristics of study population
| Group | PUCH [n (%)] | PUSH [n (%)] | |||
| CRC | Control | CRC | Control | ||
| PUCH, Peking University Cancer Hospital; PUSH, Peking University Shougang Hospital; CRC, colorectal cancer. | |||||
| Total | 4,211 | 77,099 | 436 | 56,799 | |
| Age (year) | |||||
| <45 | 444 (10.5) | 42,531 (55.2) | 17 (3.9) | 36,928 (65.0) | |
| 45−54 | 810 (19.2) | 16,893 (21.9) | 65 (14.9) | 15,131 (26.6) | |
| 55−64 | 1,297 (30.8) | 9,559 (12.4) | 129 (29.6) | 3,751 (6.6) | |
| 65−74 | 1,031 (24.5) | 5,402 (7.0) | 96 (22.0) | 488 (0.9) | |
| ≥75 | 629 (14.9) | 2,714 (3.5) | 129 (29.6) | 501 (0.9) | |
|
60.6±12.5 | 43.9±14.6 | 66.4±12.8 | 39.0±11.8 | |
| Gender | |||||
| Male | 2,470 (58.7) | 39,127 (50.7) | 252 (57.8) | 41,594 (73.2) | |
| Female | 1,741 (41.3) | 37,972 (49.3) | 184 (42.2) | 15,205 (26.8) | |
| Tumor stage | |||||
| I | 252 (6.0) | − | 37 (8.5) | − | |
| II | 595 (14.1) | − | 78 (17.9) | − | |
| III | 633 (15.0) | − | 93 (21.3) | − | |
| IV | 147 (3.5) | − | 31 (7.1) | − | |
| Unspecified | 2,584 (61.4) | − | 197 (45.2) | − | |
| Tumor location | |||||
| Colon | 2,279 (54.1) | − | 179 (41.1) | − | |
| Rectum | 1,932 (45.9) | − | 257 (58.9) | − | |