Figure 4. ADORA2A rs9608282 is associated with larger hippocampal volume in amyloid-positive participants (classified by PET scan and/or CSF-amyloid beta level).
For statistical analysis, each participant was classified by their amyloid status (positive versus negative) at the baseline visit (determined by standard cutoffs on [18F]Florbetapir PET scan and/or CSF amyloid level). The effect of the T allele on hippocampal volume was present in both amyloid-negative (left column) and amyloid-positive (right column) participants. Upon statistical analysis, rs9608282 is significantly associated with hippocampal volume in amyloid-negative and even amyloid-positive participants (p = 0.027, p =0.015, respectively).