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9,278 items of data are available, covering 9,278 participants. Some values have special meanings defined by Data-Coding 819.
There are 5291 distinct values.
Mean = 2009-08-01
269 items below graph minimum of 1979-03-13
3 items have value 1902-02-02 (Code has event date matching participant's date of birth)
32 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)
1 items have value 2037-07-07 (Code has event date in the future and is presumed to be a place-holder or other system default)
Date of the first occurrence of any code mapped to 3-character ICD10 K42. The code corresponds to "umbilical hernia". Note that events which were apparently before birth were omitted when constructing this data field.