| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2.2%
|
| 1 | One month or less | 4 |
8.9%
|
| 2 | 8 |
17.8%
|
|
| 3 | 12 |
26.7%
|
|
| 4 | 3 |
6.7%
|
|
| 6 | 14 |
31.1%
|
|
| 7 | 2 |
4.4%
|
|
| 8 | 1 |
2.2%
|
|
| Sysmiss | 315 |