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Distribution of mean blood flow velocities in the extracranial ICA for women and for men in the three age groups and in all 304 healthy subjects. Mean velocity is substantially high in women up to the age of 60 years; after this time, velocity decreases significantly. A different pattern of age dependence is seen in men: flow velocity is almost stable throughout the life span. A description of box-and-whisker plot is provided in Figure 1.
