533,334 items of data are available, covering 463,715 participants, encoded using Data-Coding 100348
Defined-instances run from 0 to 3, labelled using Instancing 2
: Initial assessment visit (2006-2010) at which participants were recruited and consent given
462,347 participants, 462,347 items
Instance 1 : First repeat assessment visit (2012-13)
19,687 participants, 19,687 items
Instance 2 : Imaging visit (2014+)
47,632 participants, 47,632 items
Instance 3 : First repeat imaging visit (2019+)
3,668 participants, 3,668 items
ACE touchscreen question "In the past, how often have you smoked tobacco?"
Field 1249 was collected from all participants except those who indicated they currently smoke on most or all days, as defined by their answers to Field 1239
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