APOE and Alzheimer disease: After stratification by APOE e4 status, variant SNP2 became a stronger protector for AD among non-APOE e4 carriers (AOR  = 0.38, 95% CI  = 0.18–0.82) as compared to APOE e4 carriers (AOR  = 0.47, 95% CI  = 0.14–1.67).