Univariate and multivariate analysis of 710 PTMC primary sites with US features for predicting skip metastasis of lymph nodes
| Features | Cases | Patients [n (%)] | χ2 | P | Multivariate model | |||
| LNs () | LNs ( +) | Odds ratio | 95% CI | P | ||||
| Size (cm) | 11.427 | 0.000 | 8.640 | 2.00737.192 | 0.004 | |||
| = 0.5 | 159 | 157 (98.7) | 2 (1.3) | |||||
| > 0.5, = 1 | 551 | 500 (90.7) | 51 (9.3) | |||||
| Taller-than-wide | 5.275 | 0.023 | 2.572 | 1.0836.108 | 0.032 | |||
| < 1 | 189 | 182 (96.3) | 7 (3.7) | |||||
| = 1 | 521 | 475 (91.1) | 46 (8.9) | |||||
| Peripheral vascularity | 1.230 | 0.289 | 1.751 | 0.5475.606 | 0.345 | |||
| No | 678 | 629 (92.8) | 49 (7.2) | |||||
| Yes | 32 | 28 (87.5) | 4 (12.5) | |||||
| Location | 21.843 | 0.000 | 0.531 | 0.3780.745 | 0.000 | |||
| Isthmus | 17 | 17 (100.0) | 0 (0.0) | |||||
| Upper | 249 | 219 (88.0) | 30 (12.0) | |||||
| Middle | 168 | 151 (90.0) | 17 (10.0) | |||||
| Lower | 276 | 270 (97.8) | 6 (2.2) | |||||
| Echogenicity | 1.391 | 0.348 | 1.363 | 0.3884.786 | 0.629 | |||
| Hyper or isoechoic | 74 | 71 (95.9) | 3 (4.1) | |||||
| Hypo-echoic | 636 | 586 (92.1) | 50 (7.9) | |||||
| Calcification | 3.977 | 0.029 | 1.722 | 0.7593.903 | 0.193 | |||
| No | 190 | 182 (95.8) | 8 (4.2) | |||||
| Yes | 520 | 475 (91.3) | 45 (8.7) | |||||
| Margin | 0.234 | 0.789 | 0.636 | 0.1672.422 | 0.507 | |||
| Clear | 52 | 49 (94.2) | 3 (5.8) | |||||
| Unclear | 658 | 608 (92.4) | 50 (7.6) | |||||
| Abutment/perimeter | 18.421 | 0.000 | 7.083 | 2.48820.164 | 0.000 | |||
| = 0.25 | 245 | 241 (98.4) | 4 (1.6) | |||||
| > 0.25 | 465 | 416 (89.5) | 49 (10.5) | |||||