| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
3.1%
|
| 1 | One month or less | 15 |
15.3%
|
| 2 | 21 |
21.4%
|
|
| 3 | 46 |
46.9%
|
|
| 4 | 8 |
8.2%
|
|
| 5 | 1 |
1%
|
|
| 6 | 2 |
2%
|
|
| 10 | 1 |
1%
|
|
| 12 | 1 |
1%
|
|
| Sysmiss | 279 |