| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
5.6%
|
| 1 | One month or less | 50 |
28.1%
|
| 2 | 26 |
14.6%
|
|
| 3 | 29 |
16.3%
|
|
| 4 | 6 |
3.4%
|
|
| 5 | 5 |
2.8%
|
|
| 6 | 6 |
3.4%
|
|
| 7 | 2 |
1.1%
|
|
| 8 | 13 |
7.3%
|
|
| 9 | 7 |
3.9%
|
|
| 10 | 5 |
2.8%
|
|
| 11 | 7 |
3.9%
|
|
| 12 | 12 |
6.7%
|
|
| Sysmiss | 918 |