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HES Data Dictionary
| HES field name | Pre-operative duration | ||||
|---|---|---|---|---|---|
| Field | preopdur | ||||
| Class | Clinical | ||||
| Length and format | 3n | ||||
| Availability | |||||
| Description | |||||
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This derived field contains the difference in days between the date the episode started (epistart) and the date of the main operation (opdte_01). |
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| Value | |||||
3n = Number of days between the start of the episode and the main operation from 0-365 null = Not applicable: no operation or episode unfinished |
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| Data cleaning |
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