Table 1. General conditions of the 570 patients.
| Categories | T1 | T2 | T3 | T4 |
|---|---|---|---|---|
| Age (years)0 | 55.28±13.3 | 58.06±11.92 | 57.33±12.66 | 55.85±13.23 |
| Operation time (min) | 250.87±76.33*4 | 260.65±64.50 | 279.22±68.01 | 280.40±86.93*1 |
| Tumor diameter (cm) | 2.76±2.09*3,4 | 3.16±1.53*3,4 | 4.94±2.61*1,2 | 5.84±3.23*1,2 |
| Gender (male/female)0 | 39/61 | 22/41 | 77/194 | 53/83 |
0, differences were not statistically significant; *, the difference was statistically significant. 1,2,3,4, the difference between the groups has statistical significance by t-test.