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21,757 items of data are available, covering 21,757 participants. Some values have special meanings defined by Data-Coding 819.
There are 6505 distinct values.
Mean = 2013-06-30
433 items below graph minimum of 1987-10-13
3 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 K31. The code corresponds to "other diseases of stomach and duodenum". Note that events which were apparently before birth were omitted when constructing this data field.