FIG 2. Graph showing the correlation between the number of VRS and the age, expressed in years, in patients (squares) and control subjects (circles). VRS are associated with age (R = 0.69, P < .001) only in controls. Least-squares regression line indicates a significant linear relationship: no. of VRS = –4.9 + 0.250 (age in years). That is, the average increment is one VRS per 4-year increment of age.