Table 1. Demographics, tumor and cervical nodes characteristics of modeling and validation group.
| Characteristics | Modeling group (n=1,001) | Validation group (n=713) | P |
|---|---|---|---|
| Gender | 0.705 | ||
| Male | 285 (28.47) | 209 (29.31) | |
| Female | 716 (71.53) | 504 (70.69) | |
| Age (years) | |||
| Mean ± SD [range] | 40.65±11.67 [18–79] | 41.11±11.93 [19–81] | 0.429 |
| ≤24 | 53 (5.29) | 34 (4.77) | 0.947 |
| 25–34 | 296 (29.57) | 214 (30.01) | |
| 35–44 | 291 (29.07) | 195 (27.35) | |
| ≥45 | 361 (36.07) | 270 (37.88) | |
| Tumor size (mm) | |||
| Mean ± SD (range) | 15.63±10.08 (3.0–92.0) | 15.83±9.62 (3.0–67.0) | 0.685 |
| ≤10 | 366 (36.56) | 257 (36.04) | 0.609 |
| ≤20 | 443 (44.26) | 292 (40.95) | |
| ≤30 | 139 (13.89) | 105 (14.73) | |
| ≤40 | 30 (3.00) | 42 (5.89) | |
| >40 | 23 (2.30) | 17 (2.38) | |
| Cervical nodes | |||
| uCLNM& | 424 (42.36) | 356 (49.93) | 0.002 |
| uLLNM& | 329 (32.87) | 266 (37.31) | 0.064 |
| pCLNM§ | 570 (56.94) | 406 (56.94) | 1.000 |
| pLLNM§ | 282 (28.17) | 234 (32.82) | 0.042 |
&, CLNM/LLNM in ultrasound; §, CLNM/LLNM in pathology; CLNM, central lymph node metastasis; LLNM, lateral lymph node metastasis.