Incidence rate ratio of Alzheimer's disease, vascular dementia, all dementia combined by ABO blood groups stratified according to attained age.

IRR* and IRR** denotes adjusted incidence rate ratio. IRR (95%CI) represents incident rate ratio and 95% confidence interval and were estimated using Poisson regression adjusted for country, sex, attained age, calendar period of observation and the interaction between country and calendar period of observation for adjusted model-1*. In adjusted model-2**, the model included additional adjustments for diabetes, stroke and myocardial infarction. Analyses were restricted to subjects with known blood group who were born in Sweden or Denmark. Blood group O is the reference category.Incidence rate ratio of Alzheimer's disease, vascular dementia, all dementia combined by ABO blood groups stratified according to attained age.