FOS and vascular dementia: Among individuals with no or one G allele, taking FOS was associated with lower risks of all-cause dementia (HR: 0.85; 95% CI: 0.78, 0.92, in individuals of AA genotype) and vascular dementia (HR: 0.80; 95% CI: 0.69, 0.93, in individuals of AA genotype; HR: 0.63; 95% CI: 0.52, 0.75, in individuals of AG genotype), whereas a risk-increasing association was observed in those homozygous for the G allele (HR: 1.29; 95% CI: 1.01, 1.65, in individuals of GG genotype).