Figure 3.

Linear regression analysis demonstrating the relationships between age and peak (a) posterior cerebral artery and (b) percent increase in PCAv. The solid line represents the regression fit for males (-•-) and the dotted line presents the regression fit for female participants (-○-). Hierarchical regression models (P value and R²) are presented for the relationship with age (model 1), the relationship with sex (model 2) and the moderator relationship of the sex dependent relationship with age (model 3). Slope coefficients (β) of the relationship with age are presented for males and females separately (model 3).