| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
5.8%
|
| 1 | One month or less | 21 |
10.2%
|
| 2 | 25 |
12.1%
|
|
| 3 | 70 |
34%
|
|
| 4 | 14 |
6.8%
|
|
| 5 | 6 |
2.9%
|
|
| 6 | 40 |
19.4%
|
|
| 7 | 4 |
1.9%
|
|
| 8 | 6 |
2.9%
|
|
| 9 | 3 |
1.5%
|
|
| 12 | 5 |
2.4%
|
|
| Sysmiss | 880 |