Table 2.

Diagnostic efficacy of the different diagnostic methods for TBTB patients.

	Sensitivity %	Specificity %	NPV %	PPV %
	95% CI	95% CI	95% CI	95% CI
Xpert MTB/RIF assay	87.2 0.811–0.915	97.7 0.912–0.996	78.7 0.696–0.858	98.7 0.950–0.998
in BALF	156/179	85/87	85/108	156/158
MTB Culture	84.9α	97.7	75.9	98.7
in BALF	0.786–0.897	0.912–0.996	0.667–0.833	0.949–0.998
	152/179	85/87	85/112	152/154
Brushing smear microscopy	35.2β 0.283–0.427	98.9 0.929–0.999	42.6γ 0.357–0.497	98.4 0.905–0.999
	63/179	86/87	86/202	63/64

TBTB, tracheobronchial tuberculosis; CI, confidence interval; MTB, Mycobacterium tuberculosis; RIF, rifampin; BALF, bronchoalveolar lavage fluid.

^αCompared with the Xpert MTB/RIF assay in BALF: χ² = 0.372, p = 0.542.

^βCompared with the Xpert MTB/RIF assay: χ² = 101.716, p = 0.000.

^γCompared with the Xpert MTB/RIF assay in BALF: χ² = 37.141, p = 0.000.