| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
2.1%
|
| 1 | One month or less | 36 |
25%
|
| 2 | 37 |
25.7%
|
|
| 3 | 21 |
14.6%
|
|
| 4 | 8 |
5.6%
|
|
| 5 | 4 |
2.8%
|
|
| 6 | 12 |
8.3%
|
|
| 7 | 3 |
2.1%
|
|
| 8 | 2 |
1.4%
|
|
| 9 | 3 |
2.1%
|
|
| 10 | 2 |
1.4%
|
|
| 12 | 13 |
9%
|
|
| Sysmiss | 468 |