| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
8.5%
|
| 1 | One month or less | 20 |
42.6%
|
| 2 | 1 |
2.1%
|
|
| 3 | 3 |
6.4%
|
|
| 4 | 1 |
2.1%
|
|
| 5 | 2 |
4.3%
|
|
| 6 | 1 |
2.1%
|
|
| 8 | 4 |
8.5%
|
|
| 9 | 1 |
2.1%
|
|
| 10 | 4 |
8.5%
|
|
| 12 | 6 |
12.8%
|
|
| Sysmiss | 102 |