Value |
Category |
-999 |
Don't know |
1 |
Less than 6 months |
2 |
Between 6 and 12 months |
3 |
More than 12 months |
11 |
.D |
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.