Description: If more regular or less regular, when did you first notice this change?
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 |
|---|---|
| 1 | Up to 1 year before last period |
| 2 | Up to 2 years before last period |
| 3 | Up to 3 years before last period |
| 4 | Up to 4 years before last period |
| 5 | More than 4 years before last period |
| Field ID | Description | Category |
|---|---|---|
| 20072 | If more regular or less regular, when did you first notice this change? | Menstrual cycle |
National Survey of Health and Development 1946 Cohort