582,717 items of data are available, covering 501,545 participants, encoded using Data-Coding 100335
Defined-instances run from 0 to 3, labelled using Instancing 2
: Initial assessment visit (2006-2010) at which participants were recruited and consent given
501,525 participants, 501,525 items
Instance 1 : First repeat assessment visit (2012-13)
20,334 participants, 20,334 items
Instance 2 : Imaging visit (2014+)
55,584 participants, 55,584 items
Instance 3 : First repeat imaging visit (2019+)
5,274 participants, 5,274 items
ACE touchscreen question "For approximately how many years have you been using a mobile phone at least once per week to make or receive calls?"
If the participant activated the Help button they were shown the message:
|Do not include time spent text messaging.|
If you are unsure, please provide an estimate or select Do not know.