Table 1 Characteristics of participants.
| PDD | PDND | Controls | p Value | |
|---|---|---|---|---|
| Participants | 16 | 20 | 20 | NA |
| Female/male | 6/10 | 11/9 | 10/10 | 0.56 |
| Mean age | 73.5 (6.5) | 72.5 (8.5) | 73.3 (6.3) | 0.9 |
| Mean MMSE score | 19.4 (4.6) | 28.2 (2.1) | 29.6 (0.7) | <0.001* |
| Mean education (years) | 10.2 (3.6) | 11.0 (3.6) | 12.1 (4.3) | 0.31 |
| Mean H&Y stage | 3.0 (0.6) | 2.4 (0.6) | NA | 0.008† |
| Mean duration of PD (years) | 12.3 (7.5) | 12.0 (6.3) | NA | 0.38 |
H&Y stage, Hoehn & Yahr stage; MMSE, Mini Mental State Examination; NA, non‐applicable; PD, Parkinson's disease; PDD, Parkinson's disease with dementia; PDND, Parkinson's disease without dementia.
*Significantly lower mean value in PDD compared with PDND and controls.
†Higher H&Y stage in PDD compared with PDND.
Standard deviation is given in parentheses.