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3,359 items of data are available, covering 3,359 participants, encoded using Data-Coding 54. Defined-instances run from 0 to 0, labelled using Instancing 2.
Against participant wishes517
Lack of time1756
Unwilling to remove contact lenses212
Reason not known11
Other health reason44
Unable to understand instructions6
Other eye-related reason585
Counts of participants/items last updated 23 Oct 2021.
Reason optical coherence tomography measurement (left eye) was not performed (entered as free-text by a UK Biobank Staff member).
This field was created by post-hoc coding the free-text reasons entered during the assessment centre visit. The encoding used was constructed after the data had been examined to determine suitable representative groupings.