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Summary of the end-tidal O2 effects associated with the six breath-hold scans. The baseline and range of end-tidal O2 values for each subject are shown and the group mean plotted (circles). The baseline end-tidal O2 values were significantly higher in all six breath-hold scans compared to the resting scan (*p < 0.0005, paired t-tests, Bonferroni corrected for multiple comparisons).
