| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
4%
|
| 1 | One month or less | 28 |
27.7%
|
| 2 | 15 |
14.9%
|
|
| 3 | 9 |
8.9%
|
|
| 4 | 4 |
4%
|
|
| 5 | 5 |
5%
|
|
| 6 | 12 |
11.9%
|
|
| 7 | 2 |
2%
|
|
| 8 | 10 |
9.9%
|
|
| 9 | 3 |
3%
|
|
| 10 | 2 |
2%
|
|
| 11 | 1 |
1%
|
|
| 12 | 6 |
5.9%
|
|
| Sysmiss | 118 |