Table 2 Summary of data for MODS and LJ culture.
From: Diagnosis of tuberculosis: the experience at a specialized diagnostic laboratory
MODS and LJ culture | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Â | Smear +ve | Smear -ve | Overall | ||||||
| Â | Culture +ve | Culture -ve | Total | Culture +ve | Culture -ve | Total | Culture +ve | Culture -ve | Total |
MODS +ve | 72(31.6) | 38(16.7) | 110(48.2) | 17(7.2) | 45(19.1) | 62(26.4) | 89(19.2) | 83(17.9) | 172(37.1) |
MODS -ve | 76(33.3) | 42(18.4) | 118(51.7) | 27(11.5) | 146(62.1) | 173(73.6) | 103(22.2) | 188(40.6) | 291(62.8) |
Total | 148(64.9) | 80(35.1) | 228(100) | 44(18.7) | 191(81.3) | 235(100) | 192(41.4) | 271(58.5) | 463(100) |
Analysis of data | |||||||||
| Â | Value | 95% Confidence Interval | Value | 95% Confidence Interval | Value | 95% Confidence Interval | |||
Sensitivity | 0.49 | 0.40 to 0.57 | 0.39 | 0.24 to 0.55 | 0.46 | 0.39 to 0.54 | |||
Specificity | 0.52 | 0.41 to 0.64 | 0.76 | 0.70 to 0.82 | 0.69 | 0.64 to 0.75 | |||
PPV | 0.65 | 0.56 to 0.74 | 0.27 | 0.17 to 0.40 | 0.52 | 0.44 to 0.59 | |||
NPV | 0.36 | 0.27 to 0.45 | 0.84 | 0.78 to 0.89 | 0.65 | 0.59 to 0.70 | |||
Likelihood Ratio | 1.02 | Â | Â | 1.64 | Â | Â | Â | 1.51 | |