Figure 3. The relationship between age and vascular measurements in normal subjects.

(a,b) Outer diameter and inner diameter did not show significant correlation with age (r = 0.13, P = 0.36 and r = −0.12, P = 0.41, respectively). (c,d) However, wall thickness and wall-to-lumen ratio showed significant correlation with age (r = 0.69, P < 0.0001 and r = 0.68, P < 0.0001, respectively).