| | Characteristic | N (%) |
| | Age: median (range) | 45 years (18–80) | | Gender | | | Male | 86 (21.1) | | Female | 321 (78.9) | | Extent of surgery | | | Lobectomy | 27 (6.6) | | Total thyroidectomy | 380 (93.3) | | Multifocal tumor | 188 (46.2) | | Capsular invasion | 126 (31.0) | | Vascular invasion | 14 (3.4) | | Soft tissue invasion | 68 (16.7) | | Positive surgical margin | 73 (17.9) | | positive lymph node | 153 (37.6) | | Tumor size > 0.8 cm | 132 (32.4) |
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