Principal component analysis and reliability of factorial scores
| Factors (items in factor) | Anatomical dimension | Variance (% explained) | Consistency (Cronbach α) | Reliability (ICC) |
| F1 (1–3, 6, 20–23) | Brainstem and cerebellum | 21.0 | 0.93 | 0.92 |
| F2 (4–5,16–17, 30) | Midbrain | 10.2 | 0.75 | 0.79 |
| F3 (8,10, 27–28, 32) | Putamen | 9.9 | 0.75 | 0.71 |
| F4 (11, 13–15) | Basal ganglia (other) | 9.4 | 0.90 | 0.49 |
| F5 (19, 25–26) | Miscellaneous | 8.2 | 0.48 | 0.76 |
ICC, intraclass coefficient.