Quantification analysis of pleural line movement for the diagnosis of pneumothorax

Table 3 The diagnostic performance of measurements obtained by tissue Doppler imaging in the diagnosis of pneumothorax

	AUC	P value	Cut-off value	Sensitivity	Specificity	PLR	NLR	PPV	NPV
PVmax (cm/s)	0.84 (0.75, 0.92)	< 0.001	0.50	96%	62%	2.53	0.07	0.72	0.93
PSmax (%)	0.72 (0.62, 0.83)	< 0.001	0.94	47%	91%	5.25	0.84	0.84	0.63
PVmax/CVmax	0.99 (0.96, 1.00)	< 0.001	1.96	93%	96%	21.00	0.07	0.95	0.93
PSmax/CSmax	0.91 (0.84, 0.97)	< 0.001	1.12	82%	93%	12.33	0.19	0.93	0.84

AUC: Area under receiver operating characteristic curve; PV_max: Peak pleural line velocity; CV_max: Peak chest wall tissue velocity; PS_max: Peak pleural line strain value; CS_max: Peak chest wall tissue strain value; PLR: Positive likelihood ratio; NLR: Negative likelihood ratio; PPV: Positive predictive value; NPV: Negative predictive value.