APOE and Alzheimer disease: Stratified analysis showed that the 39‐SNPs AD‐PRS and the 1e–5 AD‐PRS were associated with dementia among APOE ɛ4 non‐carriers (39‐SNPs AD‐PRS: HR 1.22; 95% CI 1.10–1.35, P = 2 × 10–4, 1e–5 AD‐PRS: HR 1.15, 95% CI 1.05–1.27, P = 4 × 10–3), while no association was found among ɛ4 carriers (Table 2, Figure 2).