Description: PSQI Q5d: Trouble sleeping - Cannot breathe comfortably - Insight46 phase 2
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 |
|---|---|
| 0 | Not during the past month |
| 1 | less than once a week |
| 2 | 1-2 per week |
National Survey of Health and Development 1946 Cohort