Table 1.
Contribution of variables to PC1 and PC2 in principal component analysis. Note: while determining variable contributions to principal components, only the magnitude of the contribution is considered, with no regard for directionality (i.e., plus or minus sign) because contributions in either the positive or negative direction equally explain the variance.
| All Groups | PPA and Control | ||||||
|---|---|---|---|---|---|---|---|
| PC1 (80.81%) | PC2 (11.15%) | PC1 (55.23%) | PC2 (27.83%) | ||||
| α-MSH | 5.697 | β-End | 3.414 | SP | 3.168 | NT | 2.802 |
| SP | 5.650 | NT | −1.940 | α-MSH | 2.742 | β-End | −1.960 |
| NT | 5.307 | SP | −0.619 | β-End | 2.569 | α-MSH | 1.083 |
| β-End | 4.879 | α-MSH | −0.504 | NT | 1.535 | SP | −0.706 |