Value of ultrasound guided biopsy combined with Xpert Mycobacterium tuberculosis/resistance to rifampin assay in the diagnosis of chest wall tuberculosis

Table 1 Diagnostic results of pathology and three detection techniques for chest wall tuberculosis

Detection techniques	Results	Clinical comprehensive diagnosis (n)
		Chest wall tuberculosis	Non chest wall tuberculosis	Total
Pathology	Positive	18	0	18
	Negative	4	9	13
	Total	22	9	31
Acid-fast stain	Positive	6	0	6
	Negative	16	9	25
	Total	22	9	31
Mycobacterial culture	Positive	3	0	3
	Negative	19	9	28
	Total	22	9	31
Xpert MTB/RIF	Positive	21	1	22
	Negative	1	8	9
	Total	22	9	31
Pathology and acid-fast stain	Positive	18	0	18
	Negative	4	9	13
	Total	22	9	31
Pathology and mycobacterial culture	Positive	18	0	18
	Negative	4	9	13
	Total	22	9	31
Pathology and Xpert MTB/RIF	Positive	22	1	23
	Negative	0	8	8
	Total	22	9	31

MTB/RIF: Mycobacterium tuberculosis/resistance to rifampin.

Table 2 Diagnostic values of pathology and three detection methods for the chest wall tuberculosis

Detection techniques	AUC	Sensitivity (%)	Specificity (%)	Positive predictive value (%)	Negative predictive value (%)	Kappa value	P value	Total coincidence rate (%)	Jordan index
Pathology	0.909	81.8%	100.0%	100.0%	69.2%	0.723	0.000	87.1%	81.8%
Acid-fast stain	0.636	27.3%	100.0%	100.0%	36.0%	0.179	0.081	48.4%	27.3%
Mycobacterial culture	0.568	13.6%	100.0%	100.0%	32.1%	0.084	0.244	38.7%	13.6%
Xpert MTB/RIF	0.922	95.5%	88.9%	95.5%	88.9%	0.843	0.000	93.6%	84.3%
Pathology and acid-fast stain	0.909	81.8%	100.0%	100.0%	69.2%	0.723	0.000	87.1%	81.8%
Pathology and mycobacterial culture	0.909	81.8%	100.0%	100.0%	69.2%	0.723	0.000	87.1%	81.8%
Pathology and Xpert MTB/RIF	0.944	100.0%	88.9%	95.7%	100.0%	0.913	0.000	96.8%	88.9%

AUC: Area under the curve; MTB/RIF: Mycobacterium tuberculosis/resistance to rifampin.