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Overall sensitivity, specificity, PPV and NPV of applied methods among positive samples for NTM (n = 77)
| 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 |
AFB*: acid-fast bacilli, CIa: confidence interval; PPVb: positive predictive value; NPVc: negative predictive value
