Table 3:

Multivariate analysis of risk factors of #3A lymph node involvement

Variables	OR	95% CI		P-value
		Lower CI	Upper CI
Histopathology	0.193	0.068	0.541	0.002
Metastasis of #4 LNs	4.063	1.420	11.624	0.009
Metastasis of #2 LNs	1.647	0.708	3.833	0.246

OR: odds ratios; CI: confidence intervals; LN: lymph node; #: the station number of mediastinal lymph nodes.