Table 1 Clinical and demographic characteristics of the patients (n = 6576)
Variable | Â | Patients numbers (n) |
|---|---|---|
Gender | Male | 4015 |
Female | 2561 | |
Age | >60 | 2703 |
≤60 | 3873 | |
Hypertension | Yes | 1124 |
No | 4498 | |
NA | 954 | |
Diabetes | Yes | 483 |
No | 4945 | |
NA | 1148 | |
Smoking | Yes | 3504 |
No | 2033 | |
NA | 1039 | |
Drinking | Yes | 2966 |
No | 2713 | |
NA | 897 | |
Stage | I-II | 2457 |
III-IV | 2870 | |
NA | 1249 | |
ASA Class | I-II | 2346 |
III-IV | 3773 | |
NA | 457 | |
Preoperative radiotherapy | Yes | 462 |
No | 5482 | |
NA | 632 | |
Previous chemotherapy | Yes | 165 |
No | 5567 | |
NA | 844 | |
Tumor recurrence | Yes | 475 |
No | 5601 | |
NA | 500 | |
Neck dissection | Unilateral | 557 |
Bilateral | 4648 | |
No | 1371 | |
Airway management | Yes | 4487 |
No | 1389 | |
NA | 700 | |
Operation time (min) | >600 | 1543 |
≤600 | 4681 | |
NA | 352 | |
Postoperative infection | Yes | 445 |
No | 3267 | |
NA | 2864 | |
Operation blood loss (ml) | >600 | 3011 |
≤600 | 2652 | |
NA | 913 | |
Free flap repair | Yes | 4192 |
No | 1878 | |
NA | 506 |