Description: Used to indicate uncertainty in dates when work given up.
This is a flat (unstructured) list which uses dates to represent categories or special values.
| Coding can be downloaded here as a tab-separated file. |
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| Coding | Meaning |
|---|---|
| 1910-01-01 | Prefer not to answer |
| 1920-01-01 | Do not know |
| 1930-01-01 | Not applicable |
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