Table 3

Performance of SAT and BACTEC^TM MGIT^TM 960 culture compared with clinical assessment of patients

Method and group	Result	No. of patients with a clinical diagnosis of MTB		Mean (%)
Method and group	Result	+	−	Se	Sp	PPV	NPV
SAT
All	+	146	0	66.7	100	100	34.2
All	−	73	38	66.7	100	100	34.2
Smear-positive	+	103	0	93.6	100	100	36.4
Smear-positive	−	7	4	93.6	100	100	36.4
Smear-negative	+	43	0	39.4	100	100	34.0
Smear-negative	−	66	34	39.4	100	100	34.0
BACTEC^TM MGIT^TM 960 culture
All	+	118	6	53.9	84.2	95.2	24.1
All	−	101	32	53.9	84.2	95.2	24.1
Smear-positive	+	100	4	90.9	0	96.2	0
Smear-positive	−	10	0	90.9	0	96.2	0
Smear-negative	+	18	2	16.5	94.1	90.0	26.0
Smear-negative	−	91	32	16.5	94.1	90.0	26.0

MTB, Mycobacterium tuberculosis; NPV, negative predictive value; PPV, positive predictive value; SAT, simultaneous amplification and testing; Se, sensitivity; Sp, specificity.