| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
2.7%
|
| 1 | One month or less | 10 |
6.7%
|
| 2 | 8 |
5.3%
|
|
| 3 | 20 |
13.3%
|
|
| 4 | 5 |
3.3%
|
|
| 5 | 3 |
2%
|
|
| 6 | 39 |
26%
|
|
| 7 | 4 |
2.7%
|
|
| 8 | 9 |
6%
|
|
| 9 | 10 |
6.7%
|
|
| 10 | 5 |
3.3%
|
|
| 11 | 1 |
0.7%
|
|
| 12 | 32 |
21.3%
|
|
| Sysmiss | 259 |