| Value |
Category |
| 1 |
Blood taken |
| 2 |
Not present |
| 3 |
Refused |
| 4 |
Sample not tested/lost/damaged/insufficient |
| 5 |
Not enough DBS to complete protocol |
| 6 |
Other |
| Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.