APOE and dementia: Compared to those with low-risk group (APOE ε4 dosage = 0) and the lowest air pollution score, participants with high-risk group (APOE ε4 dosage = 2) and the highest air pollution score had the greatest risk of incident dementia (HR = 10.5, 95%CI 9.31∼13.1) (Supplementary Table S5).