PDSS total score and individual items
| Controls (n=137) | Parkinson’s disease (n=143) | |||||||
|---|---|---|---|---|---|---|---|---|
| Item | Mean | SD | Scoring 0 (n) | Scoring max (n) | Mean | SD | Scoring 0 (n) | Scoring max (n) |
| PDSS, Parkinson’s disease sleep scale. | ||||||||
| Total score | 120.7 | 21.0 | 0 | 2 | 101.1 | 21.7 | 0 | 0 |
| Item 1 | 6.6 | 2.6 | 0 | 19 | 5.9 | 2.7 | 0 | 5 |
| Item 2 | 7.4 | 2.8 | 1 | 35 | 7.6 | 2.5 | 1 | 10 |
| Item 3 | 6.9 | 2.9 | 0 | 27 | 5.8 | 2.9 | 1 | 2 |
| Item 4 | 8.0 | 2.7 | 1 | 50 | 6.7 | 2.7 | 0 | 6 |
| Item 5 | 7.6 | 2.8 | 1 | 41 | 6.4 | 2.9 | 0 | 8 |
| Item 6 | 8.7 | 1.7 | 0 | 44 | 7.4 | 2.6 | 1 | 9 |
| Item 7 | 9.5 | 1.0 | 0 | 87 | 8.2 | 2.2 | 0 | 12 |
| Item 8 | 6.3 | 3.2 | 1 | 20 | 4.2 | 2.8 | 3 | 3 |
| Item 9 | 9.6 | 1.3 | 1 | 94 | 8.5 | 1.8 | 0 | 21 |
| Item 10 | 8.6 | 2.5 | 2 | 71 | 7.3 | 2.6 | 0 | 15 |
| Item 11 | 8.4 | 2.4 | 1 | 59 | 6.7 | 2.8 | 0 | 8 |
| Item 12 | 8.8 | 2.5 | 1 | 79 | 7.8 | 2.5 | 1 | 11 |
| Item 13 | 9.5 | 1.5 | 1 | 90 | 7.0 | 2.8 | 3 | 6 |
| Item 14 | 7.1 | 2.9 | 2 | 30 | 6.3 | 2.9 | 3 | 3 |
| Item 15 | 7.8 | 2.6 | 1 | 43 | 5.4 | 3.0 | 6 | 5 |