TABLE III. Classification Results of Each Feature and SVM Classifiers Using Various Combinations of Features as Input Features.

Features		SEN	SPC	AUC [95% CI]
Pleural line	TPL	0.71	0.69	0.68 [0.47–0.88]
	RPL	0.86	0.77	0.81 [0.64–0.99]
	MPLI	0.43	0.92	0.69 [0.49–0.89]
	SDPLI	0.86	0.54	0.65 [0.43–0.88]
	SVM	0.86	0.93	0.87 [0.72–1.00]
B-lines	NBL	0.86	0.92	0.91 [0.80–1.00]
	AWBL	0.86	0.92	0.91 [0.80–1.00]
	ACBL	0.93	0.46	0.70 [0.49–0.90]
	AIBL	0.93	0.62	0.74 [0.54–0.94]
	SVM	0.93	0.86	0.94 [0.86–1.00]
SVM (PL+BL)		0.93	1.00	0.96 [0.88–1.00]

TPL = thickness of pleural line, RPL = roughness of pleural line, MPLI = mean value of pleural line intensity, SDPLI = SD of pleural line intensity, NBL = number of B-lines, AWBL = accumulated width of B-lines, ACBL = attenuation coefficient of B-lines, AIBL = accumulated intensity of B-lines. SVM = support vector machine, PL = pleural line, BL = B-lines. SEN = sensitivity, SPC = specificity, AUC = area under the receiver operating characteristics curve, CI = confidence level.