| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 21 |
15.6%
|
| 1 | One month or less | 44 |
32.6%
|
| 2 | 9 |
6.7%
|
|
| 3 | 32 |
23.7%
|
|
| 4 | 5 |
3.7%
|
|
| 5 | 7 |
5.2%
|
|
| 6 | 9 |
6.7%
|
|
| 8 | 1 |
0.7%
|
|
| 10 | 1 |
0.7%
|
|
| 12 | 6 |
4.4%
|
|
| Sysmiss | 867 |