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Table 2 Diagnostic features discriminating the patients with PD from ET

From: Combination of olfactory test and substantia nigra transcranial sonopraphy in the differential diagnosis of Parkinson’s disease: a pilot study from China

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
  1. PD Parkinson’s disease, ET Essential tremor, PPV Positive predictive value, NPV Negative predictive value, SN Substantia nigra.