| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.8%
|
| 1 | One month or less | 38 |
31.1%
|
| 2 | 16 |
13.1%
|
|
| 3 | 39 |
32%
|
|
| 4 | 5 |
4.1%
|
|
| 5 | 3 |
2.5%
|
|
| 6 | 8 |
6.6%
|
|
| 7 | 3 |
2.5%
|
|
| 8 | 2 |
1.6%
|
|
| 9 | 1 |
0.8%
|
|
| 12 | 6 |
4.9%
|
|
| Sysmiss | 241 |