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Table 1 Clinical characteristics of patients with PD and ET

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

  PD (n = 37) ET (n = 26) P value
Age, years 63.8 ± 8.7 59.1 ± 12.3 0.104
Gender (male/female) 26/11 14/12 0.183
Duration, years 3.6 ± 3.1 12.0 ± 10.8 0.000
MMSE 27.5 ± 2.2 27.9 ± 1.4 0.407
SS-16 8.6 ± 2.9 12.2 ± 1.6 0.000
UPDRS-III 17.8 ± 12.3 -  
H &Y stage    
1–2 28 -  
2.5–4 9 -  
Olfactory dysfunction    0.000
SS-16 < 9.5 23 1  
SS-16 > 9.5 14 25  
SN hyperechogenicity    0.006
Positive 18 4  
Negative 19 22  
  1. PD Parkinson’s disease, ET Essential tremor, SS-16 the 16-item odor identification test from Sniffin’ Sticks, SN Substantia nigra.