Fig. 5

a–j Rotated factor loading scores of skin aging phenotypes in our study population onto the first ten principal components (PCs): a PC1, b PC2, c PC3, d PC4, e PC5, f PC6, g PC7, h PC8, i PC9, and j PC10. Binary phenotypes (i.e., skin ageing phenotypes assessed as either present or absent) with 5% or fewer cases were excluded from the PCA and do not have rotated factor loading scores. Rotated factor loading scores are reported in this figure as loading strengths. The vertical red dotted line refers to a loading strength with a magnitude of 0.50. Phenotypes with bars extending to the right of the vertical red dotted line have loading strengths with magnitudes exceeding 0.50 and are said to be strongly loaded onto the PC. Phenotypes with bars that end before the vertical red dotted line have loading strengths with magnitudes below 0.50 and are said to be weakly loaded onto the same PC