Table 3.
Sensitivity, specificity, positive and negative predictive values, and positive correlation of AFB microscopy results by both decontamination methods compared with culturea
| Method and results of microscopy for AFB | Results of culture on Lowenstein-Jensen mediuma |
||||||
|---|---|---|---|---|---|---|---|
| No. positive | No. negative | Sn (%) | Sp (%) | PPV (%) | NPV (%) | κ | |
| Modified Petroff method | |||||||
| Positive | 17 | 1 | |||||
| Negative | 25b | 107b | 40.47b | 99.07b | 94.4b | 81.06b | 0.48b |
| ReaSLR method | |||||||
| Positive | 38b | 9b | |||||
| Negative | 4 | 99 | 90.47 | 91.6 | 80.85 | 96.12 | 0.80 |
a
Sn, sensitivity, Sp, specificity; PPV, positive predictive value; NPV, negative predictive value; κ, positive correlation.
b
Agreement between microscopy and culture results.