Table 1. Study population characteristics.
| Characteristic | Non-END group | END group | P-value |
|---|---|---|---|
| Patients | 58 (86.6) | 9 (13.4) | |
| Age (yr) | 59.7 (34-83) | 62.9 (43-74) | 0.265 |
| Observation period (mo) | 78.2 (4-201) | 52.6 (0-216) | 0.110 |
| Sex | |||
| Female | 19 (32.8) | 4 (44.4) | 0.481 |
| Male | 39 (67.2) | 5 (55.6) | |
| Site of primary lesion | |||
| Gingiva | 28 (48.3) | 7 (77.8) | 0.153 |
| Maxillary sinus | 30 (51.7) | 2 (22.2) | |
| T stage | |||
| 1 | 10 (17.2) | 1 (11.1) | 0.728 |
| 2 | 10 (17.2) | 2 (22.2) | |
| 3 | 15 (25.9) | 1 (11.1) | |
| 4 | 23 (39.7) | 5 (55.6) | |
| Histological grade | |||
| Well | 8 (13.58) | 2 (22.2) | 0.777 |
| Moderate | 34 (58.6) | 5 (55.6) | |
| Poorly | 14 (24.1) | 2 (22.2) | |
| Missing | 2 (3.4) | - | |
| Resection margin | |||
| Negative | 41 (70.7) | 7 (77.8) | >0.99 |
| Positive | 17 (29.3) | 2 (22.2) |
(END: elective neck dissection)
Values are presented as number (%) or mean (range).