Table 2 Univariable analysis ultrasound features of lymph nodes in the training cohort
Variable | 0 or 1, 2 metastatic LNs (n = 187) |  ≥ 3 metastatic LNs (n = 56) | Odds Ratio | 95% CI | P-value | |
|---|---|---|---|---|---|---|
Cortical thickness | ||||||
 < 3 | 131(70.1%) | 18(32.1%) | Reference |  |  | |
 ≥ 3 | 56(29.9%) | 38(67.9%) | 4.938 | 2.598–9.386 |  < 0.000* | |
Longitudinal to transverse ratio | ||||||
 ≥ 2 | 123(65.8%) | 22(39.3%) | 2.970 | 1.605–5.497 | 0.001* | |
 < 2 | 64(34.2%) | 34(60.7%) | Reference |  |  | |
Absence of hilum | ||||||
 No | 159(85.0%) | 32(57.1%) | Reference |  |  |  |
 Yes | 28(15.0%) | 24(42.9%) | 4.259 | 2.192–8.277 |  < 0.001* | |