Table 1. Accuracy of the amplified Mycobacterium tuberculosis direct test relative to culture on Löwenstein-Jensen medium and to the BACTEC Mycobacteria Growth Indicator Tube 960 system.a.
| Variable | AMTD vs. LJ | AMTD vs. MGIT |
|---|---|---|
| Sensitivity | 87.5 (71.0-96.5) | 88.6 (73.3-96.8) |
| Specificity | 89.4 (80.8-95.0) | 92.4 (84.2-97.2) |
| Positive predictive value | 75.7 (58.8-88.2) | 83.8 (68.0-93.8) |
| Negative predictive value | 95.0 (87.7-98.6) | 94.8 (87.2-98.6) |
| Positive likelihood ratio | 8.25 (4.39-15.54) | 11.66 (5.35-25.40) |
| Negative likelihood ratio | 0.14 (0.06-0.35) | 0.12 (0.05-0.31) |
| Accuracy | 88.9 (81.7-93.9) | 91.2 (84.5-95.7) |
AMTD
: amplified Mycobacterium tuberculosis direct (test)
LJ
: Löwenstein-Jensen
MGIT
: Mycobacteria Growth Indicator Tube
a
Values expressed as % (95% CI).