| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
12.5%
|
| -7 | Does not apply | 0 |
0%
|
| 1 | One year or less | 0 |
0%
|
| 2 | 1 |
12.5%
|
|
| 5 | 2 |
25%
|
|
| 7 | 2 |
25%
|
|
| 9 | 1 |
12.5%
|
|
| 14 | 1 |
12.5%
|
|
| Sysmiss | 503 |