381,039 items of data are available, covering 332,150 participants, encoded using Data-Coding 100352
Defined-instances run from 0 to 3, labelled using Instancing 2
: Initial assessment visit (2006-2010) at which participants were recruited and consent given
307,604 participants, 307,604 items
Instance 1 : First repeat assessment visit (2012-13)
20,326 participants, 20,326 items
Instance 2 : Imaging visit (2014+)
48,634 participants, 48,634 items
Instance 3 : First repeat imaging visit (2019+)
4,475 participants, 4,475 items
ACE touchscreen question "Do you use a hearing aid most of the time?"
Initially this information was collected from all participants answering Yes to either Field 2247 (Field 10793 in the pilot) or Field 2257. When the speech-in-noise hearing test was introduced (2009), program logic was altered so that the information was collected from all participants except those who indicated they were completely deaf, as defined by their answers to Field 2247.