Fig. 4

Estimated smoothness of change in eCBs or NAEs on cognitive change by APOE-ɛ4 genotype derived from GAMs. The Y-axis depicts the partial effect of 1-year change in 2-AG on 1-year change in global cognition in APOE-ɛ4 (A), 1-year change in 2-AG on 1-year change in executive functions in APOE-ɛ4 carriers (B), and 3-year change in the ratio OEA/AEA on 3-year change in executive functions in APOE-ɛ4 noncarriers. The shaded area is the standard-error confidence intervals, and δ indicates change after 1 or 3 years. Regression coefficients (β) and 95%CI were obtained from ANCOVA models for improving the interpretability of linear relationships. The p-value indicates the significance of the smooth term in the GAM.