Construction and Evaluation of a Preoperative Prediction Model for Lymph Node Metastasis of cIA Lung Adenocarcinoma Using Random Forest

Table 1

Univariate analysis results of patients’ variables ().

Variable	Total	value
Enlargement of lymph nodes (ELN)		<0.001
Yes	188
No	933
Lobe location (LL)		0.773
Left upper lobe	264
Left lower lobe	167
Right upper lobe	370
Right middle lobe	90
Right upper lobe	230
Tumor location (TL, zone)		<0.001
Central zone	75
Middle zone	202
Peripheral zone	844
Vascular shadow (VS)		<0.001
Yes	525
No	596
Pleural indentation (PI)		<0.001
Yes	638
No	483
Lobulated and spiculated sign (LASS)		<0.001
Yes	553
No	568
Sex		0.718
Male	406
Female	715
Tumor diameter (TD-max)	(0.30-3.00)	<0.001
Tumor area (TA-max)	(0.18-9.00)	<0.001
The average diameter of the solid components (mediastinal window)	(0.00-2.75)	<0.001
The average diameter of the solid components (lung window)	(0.00-3.00)	<0.001
The solid component area (SCA, mediastinal window)	(0.00-7.56)	<0.001
The solid component area (SCA, lung window)	(0.00-9.00)	<0.001
CTR (mediastinal window)	(0.00-1.00)	<0.001
CTR (lung window)	(0.00-1.00)	<0.001
Age	(23.00-84.00)	0.267
CEA	(0.12-85.00)	<0.001
NSE	(1.35-58.20)	0.079
PaO2	(42.30-134.00)	0.741
PaCO2	(22.50-52.80)	0.022