| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 23 |
32.9%
|
| 1 | One month or less | 9 |
12.9%
|
| 2 | 5 |
7.1%
|
|
| 3 | 9 |
12.9%
|
|
| 4 | 3 |
4.3%
|
|
| 5 | 2 |
2.9%
|
|
| 6 | 6 |
8.6%
|
|
| 8 | 1 |
1.4%
|
|
| 9 | 1 |
1.4%
|
|
| 12 | 11 |
15.7%
|
|
| Sysmiss | 877 |