APOE and dementia: In APOE genotype‐stratified analysis of CID, after adjusting for covariates and death as a competing event, ε4/ε4 genotype was significantly associated with dementia risk (HR 6.38 [CI 3.8–10.7] p = 2.0 × 10−12) compared with ε3/ε3 (Table 3a).