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Partial regression plots showing the relationships between PIB index and aHV (A) and EM (B) after removing the two subjects with the highest PIB uptake from the BAC NC group. Residuals are plotted for each variable to adjust for the effects of age, gender and education. PIB index versus aHV remains significant (ΔR2 = 0.28, P = 0.026), whereas PIB index versus EM is no longer significant (ΔR2 = 0.03, P = 0.47).
