Description: Pittsburgh Sleep Quality Index (PSQI): overall sleep quality - at age 68 years
This is a flat (unstructured) list which uses strings (character sequences) to represent categories or special values.
| Coding can be downloaded here as a tab-separated file. |
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| Coding | Meaning |
|---|---|
| 0.0 | Better |
| 1.0 | One out of 3 |
| 2.0 | Two out of 3 |
| 3.0 | Worse |
| Field ID | Description | Category |
|---|---|---|
| 9847 | Pittsburgh Sleep Quality Index (PSQI): overall sleep quality - at age 68 years | Sleep |
National Survey of Health and Development 1946 Cohort