272,511 items of data are available, covering 228,610 participants, encoded using Data-Coding 100603
Defined-instances run from 0 to 3, labelled using Instancing 2
: Initial assessment visit (2006-2010) at which participants were recruited and consent given
228,600 participants, 228,600 items
Instance 1 : First repeat assessment visit (2012-13)
9,933 participants, 9,933 items
Instance 2 : Imaging visit (2014+)
31,370 participants, 31,370 items
Instance 3 : First repeat imaging visit (2019+)
2,608 participants, 2,608 items
ACE touchscreen question "Have you had any major operations? (For example, operations that required an overnight stay in hospital)"
If the participant activated the Help button they were shown the message:
|If you are unsure if you have had a 'major' operation|
select Do not know and you will be asked about this by
an interviewer later during this visit.
Field 2415 is male question equivalent of female question Field 2844