532,438 items of data are available, covering 463,728 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
462,370 participants, 462,370 items
Instance 1 : First repeat assessment visit (2012-13)
19,688 participants, 19,688 items
Instance 2 : Imaging visit (2014+)
47,338 participants, 47,338 items
Instance 3 : First repeat imaging visit (2019+)
3,042 participants, 3,042 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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