Table 2.
Principal component analysis on cerebellar tracts.
| # | Variance | Eigenvalue | Tract loadings | PD vs. HC |
|---|---|---|---|---|
| 1 | 40% | 3.61 | L DRTT: 0.54, R DRTT: 0.68, L SPCT: 0.32, R SPCT: 0.44, MCP: 0.67, L ICP: 0.66, R ICP: 0.76, L SCP: 0.73, R SCP: 0.78 | t(38.6) = 2.24, p = 0.031 |
| 2 | 16% | 1.43 | L DRTT: −0.36, R DRTT: 0.18, L SPCT: 0.60, R SPCT: 0.63, MCP: 0.50, L ICP: −0.26, R ICP: −0.21, L SCP: −0.35, R SCP: −0.20 | not retained |
| 3 | 12% | 1.04 | L DRTT: −0.31, R DRTT: −0.22, L SPCT: 0.49, R SPCT: −0.27, MCP: −0.13, L ICP: 0.58, R ICP: 0.36, L SCP: −0.07, R SCP: −0.31 | not retained |
| 4 | 8% | 0.76 | Not retained | not retained |
| 5 | 7& | 0.64 | Not retained | not retained |
| 6 | 7% | 0.63 | Not retained | not retained |
| 7 | 5% | 0.41 | Not retained | not retained |
| 8 | 3% | 0.27 | Not retained | not retained |
| 9 | 2% | 0.20 | Not retained | not retained |
For each resulting component, the explained variance and associated Eigenvalue are reported. Based on Kaiser's criterion, the first 3 components can be retained. For those, the component loadings of all the considered tracts are reported, as is the statistical comparison between patients (PD) and healthy controls (HCs), as calculated with the two-sample t-test. L, Left; R, Right.