Construction of Pulmonary Nodule CT Radiomics Random Forest Model Based on Artificial Intelligence Software for STAS Evaluation of Stage IA Lung Adenocarcinoma

Table 2

Comparison of preoperative clinical imaging data between the STAS-negative group and STAS-positive group of the stage IA lung adenocarcinoma.

Variable	STAS negative ()	STAS positive ()	value
Sex			0.549
Male	31 (42.5%)	6 (31.6%)
Female	42 (57.5%)	13 (68.4%)
Age	53.1 (10.9)	56.9 (7.61)	0.085
Maximum CT value (Hu)	-118.38 (141)	49.1 (62.9)	<0.001
Minimum CT value (Hu)	-553.00 [-659.00, -359.00]	-347.00 [-465.50, -203.00]	0.001
Mean CT value (Hu)	-321.60 [-442.01, -194.00]	-106.42 [-133.14, -60.51]	<0.001
Variance of CT values (Hu)	82.3 [58.4, 132]	115 [93.6, 152]	0.043
Kurtosis	2.40 [2.04, 2.50]	2.43 [2.13, 2.48]	0.732
Skewness	0.78 [0.39, 0.94]	-0.75 [-0.84, 0.65]	0.006
Maximum section area (mm^2)	152 [87.6, 231]	336 [171, 408]	0.004
Superficial area (mm^2)	679 [378, 1284]	1289 [852, 1921]	0.005
3D longest diameter (mm)			<0.001
Compactness			0.025
Sphericity			0.041
Entropy	8.19 [7.81, 8.57]	8.59 [8.38, 8.94]	<0.001
Location			0.659
Right upper lobe	26 (35.6%)	7 (36.8%)
Right lower lobe	18 (24.7%)	4 (21.1%)
Right middle lung	5 (6.85%)	0 (0.00%)
Left upper lung	16 (21.9%)	7 (36.8%)
Left lower lobe	8 (11.0%)	1 (5.26%)
Volume (mm^3)	1641 [703, 2997]	3476 [2345, 4167]	0.001
CTR	0.46 [0.41, 0.49]	0.50 [0.49, 0.64]	<0.001