| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
2.5%
|
| 1 | One month or less | 34 |
42.5%
|
| 2 | 6 |
7.5%
|
|
| 3 | 14 |
17.5%
|
|
| 4 | 3 |
3.8%
|
|
| 5 | 2 |
2.5%
|
|
| 6 | 17 |
21.3%
|
|
| 12 | 2 |
2.5%
|
|
| Sysmiss | 944 |