Table 4 Sensitivity, specificity, PPV, NPV and accuracy of TPUS in relation to pelvic MRI
From: Role of transperineal ultrasound in evaluation of patients with perianal inflammatory disorders
| Â | Site of the internal opening | Abscesses | Horseshoe collections | Side branches | Supralevator extension | |||||
|---|---|---|---|---|---|---|---|---|---|---|
Value (%) | 95% CI | Value (%) | 95% CI | Value (%) | 95% CI | Value (%) | 95% CI | Value (%) | 95% CI | |
Sensitivity | 91.30 | 71.96–98.93 | 33.33 | 0.84–90.57 | 100.00 | 54.07–100.00 | 50.00 | 6.76–93.24 | 33.33 | 0.84–90.57 |
Specificity | 57.14 | 18.41–90.10 | 100.00 | 87.23–100.00 | 100.00 | 85.75–100.00 | 92.31 | 74.87–99.05 | 88.89 | 70.84–97.65 |
Positive Predictive Value | 87.50 | 74.67–94.32 | 100.00 |  | 100.00 |  | 50.00 | 16.07–83.93 | 25.00 | 4.64–69.52 |
Negative Predictive Value | 66.67 | 31.47–89.70 | 93.10 | 85.85–96.78 | 100.00 |  | 92.31 | 81.74–96.99 | 92.31 | 84.21–96.43 |
Accuracy | 83.33 | 65.28–94.36 | 93.33 | 77.93–99.18 | 100.00 | 88.43–100.00 | 86.67 | 69.28–96.24 | 83.33 | 65.28–94.36 |