| 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.