Description: These values indicate participants who were previously part of a matched pair in a case-control grouping but who are no longer matched.
This is a flat (unstructured) list which uses integers to represent categories or special values.
| Coding can be downloaded here as a tab-separated file. |
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| Coding | Meaning |
|---|---|
| -998 | control without pairing |
| -999 | case without pairing |
| Field ID | Description | Category |
|---|---|---|
| 41000 | Case-control status for COVID19 imaging repeat | Coronavirus COVID-19 |
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