Value |
Category |
-97 |
dont know |
-95 |
|
1 |
within last 6 months |
2 |
more than 6 months ago |
3 |
Received but don't know when |
4 |
Never |
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.