| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
3.9%
|
| 1 | One month or less | 10 |
13.2%
|
| 2 | 1 |
1.3%
|
|
| 3 | 19 |
25%
|
|
| 4 | 4 |
5.3%
|
|
| 5 | 2 |
2.6%
|
|
| 6 | 13 |
17.1%
|
|
| 7 | 3 |
3.9%
|
|
| 8 | 11 |
14.5%
|
|
| 9 | 2 |
2.6%
|
|
| 10 | 3 |
3.9%
|
|
| 11 | 2 |
2.6%
|
|
| 12 | 3 |
3.9%
|
|
| Sysmiss | 527 |