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Diagnostic features discriminating the patients with PD from ET
| Diagnostic feature | Sensitivity(%) | Specificity(%) | PPV(%) | NPV(%) |
|---|---|---|---|---|
| (1) Hyposmia |
62.2 |
96.2 |
95.8 |
64.1 |
| (2) SN hyperechogenicity |
48.6 |
84.6 |
81.8 |
53.7 |
| (3) Either (1) or (2) present |
78.4 |
80.8 |
85.3 |
72.4 |
| (4) Both (1) and (2) present | 29.7 | 100 | 100 | 50.0 |
PD Parkinson’s disease, ET Essential tremor, PPV Positive predictive value, NPV Negative predictive value, SN Substantia nigra.
