| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
5.8%
|
| 1 | One month or less | 31 |
36%
|
| 2 | 14 |
16.3%
|
|
| 3 | 11 |
12.8%
|
|
| 4 | 3 |
3.5%
|
|
| 5 | 1 |
1.2%
|
|
| 6 | 7 |
8.1%
|
|
| 7 | 1 |
1.2%
|
|
| 8 | 1 |
1.2%
|
|
| 10 | 2 |
2.3%
|
|
| 11 | 1 |
1.2%
|
|
| 12 | 9 |
10.5%
|
|
| Sysmiss | 129 |