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Association of PWV with age in the less healthy (a) and healthy (b) groups. The central line in each panel shows the predicted line and its confidence intervals based on linear regression results of age in relation to PWV. Upper and lower lines are the 95 % and 5 % prediction bands, respectively, for acceptable values. The figure shows the scatter plot of values of PWV. For the less healthy group, certain outlying values can be observed outside the 95 % prediction band
