Participants were aged 21 to 81 years (39.7±10.5) at the time of first interview. Further, 803 participants were interviewed on a second occasion, with a mean time between interviews of 10.4±1.8 years (range = 2–13 years). Linkage analyses were run on the full sample, first, using all first interview data (Younger dataset) and second, with data from the second interview replacing first interview data for the 803 individuals interviewed twice (Older dataset).
