| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -8 | Refusal (spontaneous) | 0 |
0%
|
| 1 | One year or less | 0 |
0%
|
| 6 | 1 |
20%
|
|
| 7 | 1 |
20%
|
|
| 9 | 1 |
20%
|
|
| 10 | 1 |
20%
|
|
| 12 | 1 |
20%
|
|
| Sysmiss | 356 |