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FIG 3. Range of ipsilateral deep white matter:superficial oxygen extraction fraction ratios for all patients (n = 36) compared with values from their contralateral hemispheres (n = 36) and from healthy volunteers (15 volunteers, 30 hemispheres) is very similar. The ratio of deep white matter:superficial oxygen extraction fraction is shown on the y axis and ratios of the three groups of volunteers are shown on the x axis. The boxes indicate the 95% confidence limits for the oxygen extraction fraction ratios. The lines within the boxes indicate the median values, and the bars above and below the boxes indicate the 99% confidence limits. Patients with oxygen extraction fraction ratios beyond the 99% confidence limits are represented with black circles.
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