Fig. 2

CSF Aβ₄₂ by age and gender and stratified by APOE genotype. Scatterplot of CSF Aβ₄₂ vs participant age and predicted means with 95% CIs predicted from linear regression on gender × age interaction adjusted for APOE-ε4 status (a), and stratified by APOE-ε4 negative (b) and positive (c) from linear regression on gender by age × APOE-ε4 interaction. Aβ ₄₂ amyloid beta_1–42, APOE apolipoprotein E, CSF cerebrospinal fluid, yrs years