| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 14 |
6.7%
|
| 1 | One month or less | 46 |
21.9%
|
| 2 | 9 |
4.3%
|
|
| 3 | 29 |
13.8%
|
|
| 4 | 9 |
4.3%
|
|
| 5 | 6 |
2.9%
|
|
| 6 | 28 |
13.3%
|
|
| 7 | 2 |
1%
|
|
| 8 | 3 |
1.4%
|
|
| 10 | 3 |
1.4%
|
|
| 11 | 1 |
0.5%
|
|
| 12 | 60 |
28.6%
|
|
| Sysmiss | 503 |