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).