| Value |
Category |
| 0 |
|
| 1 |
Less than one year |
| 2 |
One to three years |
| 3 |
More than three years |
| 7 |
Missing |
| 9 |
Don't know |
| 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.
