Figure 8.

Partial regression plots showing results from a recursive regression procedure suggesting a sequential relationship between the three variables, with aHV mediating the relationship between PIB index and EM. Residuals are plotted for each variable to adjust for the effects of age, gender and education. (A) The relationship between PIB index and EM before (solid line, P = 0.0044) and after controlling for aHV (dashed line; ΔR² = 0.00, P = 0.50). (B) The relationship between aHV and EM before (solid line, P = 0.000023) and after controlling for PIB index (dashed line; ΔR² = 0.15, P = 0.0015).