Comparison of wall composition and changes in pulse wave velocity with age between central and peripheral arterial regions. cfPWV, carotid-femoral pulse wave velocity (central); faPWV, femoral-ankle pulse wave velocity (lower-limb); crPWV, carotid-radial pulse wave velocity; baPWV, brachial ankle pulse wave velocity (composite measure). baPWV summates the arterial properties between the descending aorta at the level of the brachial artery and the ankle, comprising of arteries or arterial regions (e.g. the aorta) with different structural and mechanical characteristics.