Table 2:
Univariate analysis for factors associated with Station 3A lymph node metastasis
| Variables | OR | 95% CI | P-value |
|---|---|---|---|
| Gender | |||
| Male | 0.705 | 0.318, 1.566 | 0.391 |
| Female | |||
| Age (years) | |||
| <50 | 1.927 | 0.589, 6.289 | 0.278 |
| 50–70 | 2.745 | 0.976, 7.720 | 0.156 |
| >70* | |||
| Tumour location | |||
| RUL | 0.475 | 0.056, 4.023 | 0.495 |
| RML | 0.531 | 0.051, 5.553 | 0.579 |
| RLL | 0.839 | 0.091, 7.769 | 0.877 |
| RH* | |||
| Histopathology | |||
| Sq | 0.175 | 0.064, 0.480 | 0.001 |
| Non-Sq | |||
| Tumour size (cm) | |||
| <2 | 1.829 | 0.293, 11.427 | 0.519 |
| 2–3 | 1.782 | 0.305, 10.413 | 0.521 |
| 3–5 | 2.089 | 0.349, 12.489 | 0.419 |
| >5* | |||
| Skipping metastasis | |||
| Skipping | 0.585 | 0.271, 1.261 | 0.171 |
| Non-skipping | |||
| Metastasis of #2 LNs | |||
| Positive | 2.598 | 1.193, 5.654 | 0.016 |
| Negative | |||
| Metastasis of #4 LNs | |||
| Positive | 4.716 | 1.722, 12.916 | 0.003 |
| Negative | |||
| Metastasis of #7 LNs | |||
| Positive | 0.660 | 0.274, 1.315 | 0.202 |
| Negative | |||
| Metastasis of #8 LNs | |||
| Positive | 0.917 | 0.249, 3.376 | 0.897 |
| Negative | |||
| Metastasis of #9 LNs | |||
| Positive | 0.481 | 0.106, 2.188 | 0.344 |
| Negative | |||
RUL: right upper lobe; RML: right middle lobe; RLL: right lower lobe; RH: right hilum; Sq: squamous cell carcinoma; non-Sq: non-squamous cell carcinoma; OR: odds ratios; CI: confidence intervals; LN: lymph node; #: the station number of mediastinal lymph nodes;
*Reference category.