| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
8.3%
|
| 1 | One month or less | 0 |
0%
|
| 3 | 6 |
50%
|
|
| 4 | 3 |
25%
|
|
| 6 | 1 |
8.3%
|
|
| 9 | 1 |
8.3%
|
|
| Sysmiss | 108 |