Comparison of smear and ligase chain reaction in culture positive tuberculosis
| Smear | Ligase chain reaction | |
|---|---|---|
| Sensitivity | 66.7% (48.2 to 82.0) | 93.9% (80 to 99) |
| Specificity | 100% (99.8 to 100) | 99.8% (99.4 to 99.9) |
| Positive predictive value | 100% (84.6 to 100) | 83.8% (68.0 to 93.8) |
| Negative predictive value | 99.5% (99.2 to 99.8) | 99.9% (99.7 to 99.9) |
| p value (χ2test) | <0.0001 | <0.0001 |
Values are percentages with 95% confidence intervals in parentheses.