393,967 items of data are available, covering 336,883 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
307,557 participants, 307,557 items
Instance 1 : First repeat assessment visit (2012-13)
20,325 participants, 20,325 items
Instance 2 : Imaging visit (2014+)
60,811 participants, 60,811 items
Instance 3 : First repeat imaging visit (2019+)
5,274 participants, 5,274 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.