| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.7%
|
| 1 | One month or less | 3 |
5%
|
| 2 | 3 |
5%
|
|
| 3 | 13 |
21.7%
|
|
| 4 | 6 |
10%
|
|
| 5 | 4 |
6.7%
|
|
| 6 | 17 |
28.3%
|
|
| 7 | 4 |
6.7%
|
|
| 8 | 1 |
1.7%
|
|
| 9 | 4 |
6.7%
|
|
| 12 | 4 |
6.7%
|
|
| Sysmiss | 180 |