Normocapnic cerebral blood flow velocity (V_mean) in relation to hematocrit (Ht). (A) Normocapnic V_mean was inversely correlated to Ht across all participants (r_s = −0.46, P = 0.004; n = 38). (B) The relationship between normocapnic V_mean and Ht was not statistically significant when the correlation analyses for the SCD patients (●; r_s = −0.36, P = .098; n = 23) and healthy controls (Δ; r_s = −0.01, P = .96; n = 16) were performed separately.