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347 items of data are available, covering 347 participants. Some values have special meanings defined by Data-Coding 819.
There are 245 distinct values.
Mean = 2006-12-14
12 items have value 1902-02-02 (Code has event date matching participant's date of birth)
81 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 Q40. The code corresponds to "other congenital malformations of upper alimentary tract". Note that events which were apparently before birth were omitted when constructing this data field.