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42,814 items of data are available, covering 20,301 participants. Array indices run from 0 to 27.
There are 5435 distinct values.
Mean = 1989-04-15
Counts of participants/items last updated 13 Apr 2019.
This field provides for each participant the date each ICD 9 diagnosis code was first recorded as a primary diagnosis across all their episodes in hospital. The date provided in this field is the episode start date (Field 41083; epistart in the hesin table), or if this was missing the admission date (Field 41096; admidate in the hesin table). The corresponding primary ICD9 diagnosis codes can be found in Field 41203 and they can be linked using the array structure.
Please note ICD9 coded hospital data are only available for older Scottish hospital records.