604,083 items of data are available, covering 501,499 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
501,471 participants, 501,471 items
Instance 1 : First repeat assessment visit (2012-13)
20,333 participants, 20,333 items
Instance 2 : Imaging visit (2014+)
75,333 participants, 75,333 items
Instance 3 : First repeat imaging visit (2019+)
6,946 participants, 6,946 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.