Table 4.
Mahalanobis distances between groups for within band analyses
| Frequency Band | PD-NC | PD-MCI | PDD |
|---|---|---|---|
| Alpha | |||
| PD-NC | 0 | 0.7037 | 1.2021 |
| PD-MCI | 0.7037 | 0 | 1.8277 |
| PDD | 1.2021 | 1.8277 | 0 |
| Delta | |||
| PD-NC | 0 | 1.6108 | 2.2343 |
| PD-MCI | 1.6108 | 0 | 2.1652 |
| PDD | 2.2343 | 2.1652 | 0 |
| Theta | |||
| PD-NC | 0 | 1.1173 | 2.123 |
| PD-MCI | 1.1173 | 0 | 2.123 |
| PDD | 2.123 | 2.123 | 0 |
Mahalanobis distances showing a greater separation between the Parkinson’s disease mild cognitive impairment (PD-MCI) and Parkinson’s disease dementia (PDD) distributions as between the PDD and Parkinson’s disease normal cognition (PD-NC) distributions, particularly in the alpha and delta bands. For the theta band, by contrast, the distance from PD-NC to PDD is roughly equal to the sum of the other two distances.