Table 1.
Demographic characteristics and clinical features
| Variables | Cases (n =1134) | Controls (n = 1228) | Pa | |||
|---|---|---|---|---|---|---|
| n | % | n | % | |||
| Age (years) | 0.754 | |||||
| ≤ 45 | 590 | 52.0 | 631 | 51.4 | ||
| > 45 | 544 | 48.0 | 597 | 48.6 | ||
| Sex | 0.846 | |||||
| Male | 355 | 31.3 | 389 | 31.7 | ||
| Female | 779 | 68.7 | 839 | 68.3 | ||
| Topography | ||||||
| T1 | 885 | 78.0 | ||||
| T2 | 138 | 12.2 | ||||
| T3 | 98 | 8.6 | ||||
| T4 | 13 | 1.2 | ||||
| Lymph Node | ||||||
| N0 | 695 | 61.3 | ||||
| N1 | 439 | 38.7 | ||||
| Metastasis | ||||||
| M0 | 1113 | 98.2 | ||||
| M1 | 21 | 1.8 | ||||
| Grade | ||||||
| I + II | 963 | 84.9 | ||||
| III + IV | 171 | 15.1 | ||||
a Two-sided c2 test for the frequency distributions of selected variables between cases and controls.