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Table 2: 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