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Group means (±SD) data for percent change in middle cerebral artery blood velocity (ΔMCAv%, A) and cerebral vascular conductance index (ΔCVCi%, B) at increases in end-tidal carbon dioxide (Δ) of 3, 6, 9, 12, and 15 mmHg from baseline between control (n = 10), asymptomatic (ASYM; n = 7) and symptomatic (SYM; n = 8) groups.
