| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
13.5%
|
| 1 | One month or less | 13 |
13.5%
|
| 2 | 21 |
21.9%
|
|
| 3 | 19 |
19.8%
|
|
| 4 | 2 |
2.1%
|
|
| 5 | 1 |
1%
|
|
| 6 | 9 |
9.4%
|
|
| 8 | 1 |
1%
|
|
| 9 | 1 |
1%
|
|
| 10 | 2 |
2.1%
|
|
| 11 | 1 |
1%
|
|
| 12 | 13 |
13.5%
|
|
| Sysmiss | 137 |