Figure 1.

Association of age with cerebral blood flow (CBF) measured by color-coded duplex ultrasonography (CDUS), Continued.phase-contrast MRI (PC-MRI), arterial spin labeling (ASL), and CBF velocity measured by transcranial Doppler (TCD) at the middle cerebral artery. Solid line, dotted line, and dashed lines represent the regression equations obtained for all subjects, men, and women, respectively. The rates of decreases in CBF and blood flow velocity were similar between women and men (p-values of the interaction of age and sex in one-way analysis of covariance: CDUS CBF, p = 0.085; PC-MRI CBF, p = 0.635; ASL, p = 0.970; TCD CBF velocity, p = 0.933).