APOE and dementia: Sensitivity analyses demonstrated that the significant relationship between night/shift working and reduced all-cause (excluding vascular) dementia risk remained similar after additionally controlling for APOE ɛ4 allele carriage (HR 0.27, 95% CI 0.08, 0.89, P = 0.03) or childhood cognition (HR 0.36, 95% CI 0.13, 0.99, P = 0.048).