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82,317 items of data are available, covering 82,317 participants. Some values have special meanings defined by Data-Coding 819.
There are 9525 distinct values.
Mean = 2009-09-16
729 items below graph minimum of 1976-05-28
4 items have value 1902-02-02 (Code has event date matching participant's date of birth)
2 items have value 1903-03-03 (Code has event date after participant's date of birth and falls in the same calendar year as date of birth)
Date of the first occurrence of any code mapped to 3-character ICD10 K21. The code corresponds to "gastro-oesophageal reflux disease". Note that events which were apparently before birth were omitted when constructing this data field.