532,840 items of data are available, covering 463,723 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
462,358 participants, 462,358 items
Instance 1 : First repeat assessment visit (2012-13)
19,687 participants, 19,687 items
Instance 2 : Imaging visit (2014+)
47,634 participants, 47,634 items
Instance 3 : First repeat imaging visit (2019+)
3,161 participants, 3,161 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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