For the cohort design, by hypothesizing that the incidence rates of neuro-inflammatory AD vary between 1 and 10/100,000 person-years and the incidence rates of other AD vary between 50 and 100/100,000 person-years, cohorts of 50,000 subjects each should allow the detection, with 80% power, of a relative risk between 18.7 and 3.7 and between 2.0 and 1.6 respectively for the neuro-inflammatory AD and other AD (our 2 co-primary endpoints). Because of risk of loss to follow-up and missing data, the sample size was increased by 30% for a total of 65,000 subjects in each cohort.
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