Sensitivity and specificity of baseline radiological and bacteriological findings in predicting outcome (2-month sputum acid-fast bacilli (AFB) status)
| Sensitivity | Specificity | |
| Radiological parameters at diagnosis | ||
| Derivation data set | ||
| Total amount of lung affected | ||
| 20% | 96 | 35.9 |
| 37.5% (optimal cut-off point) | 84 | 68.0 |
| 80% | 20 | 89.7 |
| Cavitation | 80 | 44.9 |
| Score | ||
| 20 | 100 | 18.0 |
| 72.5 (optimal cut-off point) | 80 | 71.2 |
| 130 | 8 | 98.7 |
| Validation data set | ||
| Total amount of lung affected | ||
| 20% | 96.7 | 22.6 |
| 42.0% (optimal cut-off point) | 73.3 | 62.4 |
| 80% | 30 | 87.1 |
| Cavitation | 83.3 | 52.7 |
| Score | ||
| 20 | 96.7 | 22.6 |
| 71 (optimal cut-off point) | 80 | 67.7 |
| 130 | 10 | 91.4 |
| Bacteriological parameters: baseline smear grade | ||
| Derivation data set | ||
| AFB density* | 60.9 | 61.3 |
| Validation data set | ||
| AFB density * | 48.4 | 88.2 |
↵* Baseline AFB density (smear grade) dichotomised as ≤2 or 3.