Description: Were there any difficulties in taking blood sample - issue 3 - at age 53 years
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| Coding can be downloaded here as a tab-separated file. |
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| Coding | Meaning |
|---|---|
| 4 | Second attempt necessary |
| Field ID | Description | Category |
|---|---|---|
| 30179 | Were there any difficulties in taking blood sample - issue 3 - at age 53 years | Blood sample |
National Survey of Health and Development 1946 Cohort