Table 2.
Characteristic metrics of the items, domains, and total scores on the Parkinson's Disease Cognitive Rating Scale
| Variable | Score | 10% Score Maximum | Floor Effect | Ceiling Effect | ||
|---|---|---|---|---|---|---|
| Mean | Median | Difference: Mean‐Median | ||||
| Immediate Verbal Memory (free recall) | 6.4 | 6.0 | 0.4 | 1.2 | 4.0 | 0.9 |
| Confrontation Naming | 15.4 | 17.0 | −1.6 | 2.0 | 2.2 | 0.9 |
| Sustained Attention | 4.1 | 2.0 | 2.1 | 1.0 | 39.4 | 1.7 |
| Working Memory | 5.2 | 5.0 | 0.2 | 1.0 | 15.7 | 1.7 |
| Spontaneous Clock Drawing | 8.6 | 8.0 | 0.6 | 1 | 6.2 | 6.2 |
| Clock Copying | 7.9 | 9.0 | −1.1 | 1.0 | 4.9 | 32.2 |
| Delayed Verbal Memory (free recall) | 2.7 | 2.0 | 0.7 | 1.2 | 39.4 | 1.7 |
| Alternating Verbal Fluency | 5.1 | 5.0 | 0.1 | 2.0 | 29.6 | 0.9 |
| Action Verbal Fluency | 15.5 | 13.0 | 2.5 | 3.0 | 7.6 | 0.9 |
| Score subcortical | 51.5 | 51.6 | −0.1 | 10.4 | 1.3 | 0.9 |
| Score cortical | 24.4 | 24.4 | 0.0 | 3.0 | 2.2 | 2.6 |
| Total score | 76.0 | 76.0 | 0.0 | 13.4 | 2.6 | 1.7 |