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The mean and standard deviation (SD) of the striatal-to-reference ratio (SRR) for the different cohorts.
| Mean | SD | |
|---|---|---|
| PD group | 1.47 | 0.19 |
| Group≤2 | 1.55 | 0.17 |
| Group3–5 | 1.48 | 0.19 |
| Group6–10 | 1.43 | 0.16 |
| Group≥11 | 1.35 | 0.17 |
| nPD group | 1.95 | 0.22 |
| Healthy control | 2.02 | 0.20 |
| Essential tremor | 1.89 | 0.23 |
