| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
3.2%
|
| 1 | One month or less | 4 |
4.3%
|
| 2 | 16 |
17.2%
|
|
| 3 | 9 |
9.7%
|
|
| 4 | 6 |
6.5%
|
|
| 5 | 3 |
3.2%
|
|
| 6 | 20 |
21.5%
|
|
| 7 | 8 |
8.6%
|
|
| 8 | 3 |
3.2%
|
|
| 9 | 5 |
5.4%
|
|
| 10 | 1 |
1.1%
|
|
| 11 | 1 |
1.1%
|
|
| 12 | 14 |
15.1%
|
|
| Sysmiss | 309 |