Description: Length of time since headaches began or ended with option of prefer not to answer
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 |
|---|---|
| -818 | Prefer not to answer |
| -98 | 0 months ago |
| -97 | 0 years ago |
| Field ID | Description | Category |
|---|---|---|
| 120055 | When worst headaches began | Experience of pain |
| 120056 | When worst headaches ended | Experience of pain |
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