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1,948 items of data are available, covering 1,948 participants. Some values have special meanings defined by Data-Coding 819.
There are 1505 distinct values.
Mean = 1983-10-09
1 items have value 1902-02-02 (Code has event date matching participant's date of birth)
Date of the first occurrence of any code mapped to 3-character ICD10 O81. The code corresponds to "single delivery by forceps and vacuum extractor". Note that events which were apparently before birth were omitted when constructing this data field.