FIGURE 1.
Overview of the cognitive measurements in participants aged 45+ y in the Doetinchem Cohort Study. 1Cohort measurement rounds are denoted as R1, R2, R3, R4, R5, and R6. 2Cognitive measurement rounds are denoted as t0, t5, t10, t15, and t20, where t0 refers to the first cognitive measurement and therefore baseline measurement in the present study. 3Cognitive testing started as a pilot halfway through R2, from 1995. 4Participants who had their t10, t15, or t20 cognitive measurement between 2013 and 2017 could not have another follow-up measurement yet.