Table 2.
Diagnostic values of different ultrasound parameters
| Ultrasound parameters | Specificity (%), n/n | Sensitivity (%), n/n | PPV (%), n/n | NPV (%), n/n | Accuracy (%), n/n | AUC | P* |
|---|---|---|---|---|---|---|---|
| Hypoechonic | 53.8 (14/26) | 78.5 (33/42) | 73.3 (33/45) | 60.8 (14/23) | 69.1 (47/68) | 0.662 | 0.000 |
| Distinct boundary | 57.6 (15/26) | 83.3 (35/42) | 76.1 (35/46) | 68.1 (15/22) | 73.5 (50/68) | 0.705 | 0.001 |
| Uneven echo | 38.4 (10/26) | 73.8 (31/42) | 65.9 (31/47) | 47.6 (10/21) | 60.3 (41/68) | 0.561 | 0.000 |
| Short diameter ≥1cm | 76.9 (20/26) | 80.9 (34/42) | 85.0 (34/40) | 71.4 (20/28) | 79.4 (54/68) | 0.732 | 0.000 |
| Elastography score ≥2.5 | 76.9 (20/26) | 85.7 (36/42) | 85.7 (36/42) | 76.9 (20/26) | 82.3 (56/68) | 0.852 | 0.011 |
| Strain ratio ≥32.07 | 80.8 (21/26) | 88.1 (37/42) | 88.1 (37/42) | 80.8 (21/26) | 85.3 (58/68) | 0.933 | - |
*P versus strain ratio (AUC). PPV: Positive predictive value; NPV: Negative predictive value; AUC: Area under the curve