Paired-Pulse Inhibition in the Auditory Cortex in Parkinson's Disease and Its Dependence on Clinical Characteristics of the Patients

Table 3

Correlation coefficients between the averaged value of the paired-pulse inhibition (PPI) and the characteristics of the PD patients.

Characteristics of the PD patients	Averaged value of PPI; (%) in patients (𝑁=58)
Age	−0.29^∗
Sex	0.13
Disease duration	−0.04
Age of the onset of the disease	−0.28^∗
Hoehn and Yahr stage	−0.15
Summary UPDRS score	−0.14
Body bradykinesia score; (point 31 of UPDRS)	−0.35^∗∗
Duration of the levodopa intake	0.10 (𝑁=46)
Levodopa dosage	0.28 (𝑁=46)
Summary MMSE score	0.40^∗∗
Attention and memory score (points 3 plus 4 of MMSE)	0.43^∗∗∗

Averaged value of PPI was evaluated for 500, 700, and 900 ms interstimulus intervals. 𝑁:-number of patients. Level of significance: ∗ is 𝑃<.05; ∗∗ is 𝑃<.01; ∗∗∗ is 𝑃<.001 (nonparametric Spearman rank-order correlation).