Table 4.
Diagnostic accuracy of the ‘time to wash-out’ cut-off values above and below 55 s, for diagnosis of HCC and non-HCC malignant lesions, respectively
| Cut-off time to wash-out of contrast agent | ||
|---|---|---|
| For HCC diagnosis | > 55 s | Sensitivity: 95.6% (95% CI 92–98%) |
| Specificity: 100.0% (95% CI 81.5–100.0%) | ||
| PPV: 100.0% (95% CI 98.3–100.0%) | ||
| NPV: 64.2% (95% CI 44–81.3%) | ||
| Diagnostic accuracy: 92.7% | ||
| For diagnosis of malignant lesions other than HCC | ≤ 55 s | Sensitivity: 100% (95% CI 81.4–100.0%) |
| Specificity: 98.2% (95% CI 95.6–99.5%) | ||
| PPV: 82% (95% CI 59.7–94.8%) | ||
| NPV: 100.0% (95% CI 93.3–100.0%) | ||
| Diagnostic accuracy: 98.3% | ||
CI: confidence interval; HCC: hepatocellular carcinoma; NPV: negative predictive value; PPV: positive predictive value.