| Value |
Category |
| -9 |
don’t know |
| -8 |
refusal |
| 1 |
less than 1 year |
| 2 |
|
| 3 |
|
| 4 |
|
| 5 |
|
| 6 |
|
| 8 |
|
| 9 |
|
| 10 |
|
| 11 |
|
| 15 |
|
| 20 |
|
| 30 |
|
| 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.
