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AMB Express

Table 5 Overall sensitivity, specificity, PPV and NPV of applied methods among positive samples for NTM (n = 77)

From: Molecular identification of non-tuberculous mycobacterial species isolated from extrapulmonary samples using real-time PCR and rpoB sequence analysis

Method

Sensitivity % (95% CI)a

Specifiticy% (95% CI)

PPVb %

NPVc %

AFB*

29 (33–43)

34 (23–47)

34

53

Culture

100 (87–100)

100 (87–100)

100

99

NTM Real-time PCR

80 (72–89)

77 (62–88)

88

91

rpoB sequencing

100 (87–100)

100 (87–100)

100

98

  1. AFB*: acid-fast bacilli, CIa: confidence interval; PPVb: positive predictive value; NPVc: negative predictive value
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