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Three-way interaction between age, total blood volume at 6.03 ml, 24.12 ml and 42.2 ml, and (a) SSV CSF. (b) Ventricular CSF. Blood volumes were selected by the model as they represent lower, middle and upper thirds in the cohort. Shaded areas represent the confidence intervals of the regressions. SSV, Selective Sulcal Volume; TBV, Total Blood Volume
