Table 1. Characteristics of the study population diagnosed from the 1960s to 2008.
| Total | 60s | 70s | 80s | 90s | 00s | P | |
|---|---|---|---|---|---|---|---|
| Total | 4558 | 98/2.15 | 294/6.45 | 462/10.1 | 1124/24.7 | 2580/56.6 | |
| Age | 0.0001 | ||||||
| <50 | 1445/31.7 | 53/54.1 | 158/54.3 | 178/38.5 | 352/31.3 | 704/27.3 | |
| 50-59 | 1227/26.9 | 31/31.6 | 82/28.2 | 155/33.5 | 288/25.6 | 671/26.0 | |
| 60-69 | 1149/25.2 | 13/13.3 | 49/16.8 | 90/19.5 | 321/28.6 | 676/26.2 | |
| 70-79 | 654/14.4 | 1/1.0 | 2/0.7 | 34/7.4 | 141/12.5 | 476/18.4 | |
| >80 | 80/1.8 | 0 | 0 | 5/1.1 | 22/2.0 | 53/2.1 | |
| Gender | 0.807 | ||||||
| Male | 2625/57.6 | 59/60.2 | 167/56.8 | 260/56.3 | 636/56.6 | 1503/58.3 | |
| Female | 1933/42.4 | 39/39.8 | 127/43.2 | 202/43.7 | 488/43.4 | 1077/41.7 | |
| Tumor site | 0.0001 | ||||||
| Ascending | 682/15 | 15/15.3 | 47/16.0 | 69/14.9 | 150/13.3 | 401/15.5 | |
| Transverse | 157/3.4 | 7/7.1 | 14/4.8 | 13/2.8 | 30/2.7 | 93/3.6 | |
| Descending | 249/5.5 | 6/6.1 | 13/4.4 | 23/5.0 | 60/5.3 | 147/5.7 | |
| Sigmoid | 808/17.7 | 13/13.3 | 36/12.2 | 54/11.7 | 170/15.1 | 535/20.7 | |
| Rectum | 2662/58.4 | 57/58.2 | 184/62.6 | 303/65.6 | 714/63.5 | 1404/54.4 | |
| T stage | 0.0001 | ||||||
| 1 | 240/5.3 | 1/1.1 | 7/2.4 | 18/3.9 | 45/4.0 | 169/6.6 | |
| 2 | 1126/24.9 | 32/34 | 87/30.2 | 170/37.1 | 342/30.6 | 495/19.4 | |
| 3 | 1860/41.2 | 50/53.2 | 186/64.6 | 241/52.6 | 554/49.6 | 829/32.4 | |
| 4 | 1289/28.5 | 11/11.7 | 8/2.8 | 29/6.3 | 177/15.8 | 1064/41.6 | |
| N stage | 0.0001 | ||||||
| 0 | 3012/68.6 | 70/76.9 | 214/82.9 | 348/81.5 | 761/73.0 | 1619/62.9 | |
| 1 | 938/21.4 | 20/22 | 28/10.9 | 50/11.7 | 202/19.4 | 638/24.8 | |
| 2 | 443/10.1 | 1/1.1 | 16/6.2 | 29/6.8 | 79/7.6 | 318/12.3 |