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20,769 items of data are available, covering 20,769 participants. Some values have special meanings defined by Data-Coding 819.
There are 2940 distinct values.
Mean = 1966-06-09
1 items have value 1902-02-02 (Code has event date matching participant's date of birth)
9 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 B01. The code corresponds to "varicella [chickenpox]". Note that events which were apparently before birth were omitted when constructing this data field.