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502,357 items of data are available, covering 502,357 participants.
There are 4659 distinct values.
Mean = 2016-11-20
This indicates the date on which a participant last personally contributed data to UK Biobank (i.e. the most recent occasion/event), either by attendance at an assessment centre, completing an online questionnaire. or by returning a device. The large spike on the graph is due to the number of participants who completed the last online questionnaire.
For a list of the events summarised by this field, see the Related Data-Fields tab under Field 20145.