Table 1.
Baseline patient characteristics
| Characteristic | Tumor diameter |
Tumor volume |
||||
|---|---|---|---|---|---|---|
| T1a | T1b | p-value | V1a | V1b | p-value | |
| Tumor size (cm) | ||||||
| Mean±SD | 0.64±0.19 | 1.38±0.27 | 0.69±0.24 | 1.50±0.25 | ||
| Sex | ||||||
| Female | 734 (89.2) | 222 (86.0) | 0.169 | 808 (88.6) | 148 (87.6) | 0.703 |
| Male | 89 (10.8) | 36 (14.0) | 104 (11.4) | 21 (12.4) | ||
| Age (yr) | ||||||
| Mean±SD | 48.00±10.50 | 48.58±11.47 | 48.14±10.49 | 48.15±12.03 | ||
| < 45 | 325 (39.5) | 96 (37.2) | 0.512 | 351 (38.5) | 70 (41.4) | 0.473 |
| ≥ 45 | 498 (60.5) | 162 (62.8) | 561 (61.5) | 99 (58.6) | ||
| Surgery | ||||||
| Lobectomy+isthmectomy | 590 (71.7) | 115 (44.6) | < 0.001 | 635 (69.6) | 70 (41.4) | < 0.001 |
| Total thyroidectomy | 233 (28.3) | 143 (55.4) | 277 (30.4) | 99 (58.6) | ||
| Histological subtype | ||||||
| Classic | 776 (94.3) | 238 (92.2) | 0.235 | 857 (94.0) | 157 (92.9) | 0.596 |
| Follicular variant | 47 (5.7) | 20 (7.8) | 55 (6.0) | 12 (7.1) | ||
| Location | ||||||
| Right | 439 (53.3) | 139 (53.9) | 0.062 | 485 (53.2) | 93 (55.0) | 0.005 |
| Left | 363 (44.1) | 105 (40.7) | 404 (44.3) | 64 (37.9) | ||
| Isthmus | 21 (2.6) | 14 (5.4) | 23 (2.5) | 12 (7.1) | ||
| CLND | ||||||
| Performed | 466 (56.6) | 147 (57.0) | 0.920 | 514 (56.4) | 99 (58.6) | 0.593 |
| Not performed | 357 (43.4) | 111 (43.0) | 398 (43.6) | 70 (41.4) | ||
Values are presented as number (%) unless otherwise indicated. SD, standard deviation; CLND, central lymph node dissection.