Table 3. Diagnostic accuracy of X-ray and MRI for detecting bone tumors taking histopathology as gold standard.
| Standard positive (n = 81) | Standard negative (n = 11) | |
| X-ray | ||
| Index test positives | 76 (true positive) | 5 (false positive) |
| Index test negatives | 7 (false negative) | 4 (true negative) |
| Sensitivity | 91.56% | |
| Specificity | 44.4% | |
| Positive predictive value | 93.8% | |
| Negative predictive value | 36.3% | |
| Diagnostic accuracy | 86.95% | |
| MRI | ||
| Index test positives | 74 (true positive) | 2 (false positive) |
| Index test negatives | 6 (false negative) | 5 (true negative) |
| Sensitivity | 92.5% | |
| Specificity | 71.42% | |
| Positive predictive value | 97.3% | |
| Negative predictive value | 54.5% | |
| Diagnostic accuracy | 87.0% | |