Correlations between manual measurement and digital analysis of substantia nigra echogenicity for both machines, between measurements performed using different machines, and between the right and left substantia nigra using both manual measurement and digital analysis
| Correlations | Spearman Coefficient | P Value |
|---|---|---|
| Between manual measurement and digital analysis for My Lab Twice | 0.630 | <.0001 |
| Between manual measurement and digital analysis for Vivid Pro 7 | 0.553 | <.0001 |
| Between digital analysis using different machines | 0.686 | <.0001 |
| Between visual measurements using different machines | 0.721 | <.0001 |
| Between the right and left substantia nigra using digital analysis and My Lab Twice | 0.575 | <.0001 |
| Between the right and left substantia nigra using digital analysis and Vivid Pro 7 | 0.512 | .0001 |
| Between the right and left substantia nigra using manual measurement and My Lab Twice | 0.494 | .0003 |
| Between the right and left substantia nigra using manual measurement and Vivid Pro 7 | 0.631 | <.0001 |