| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
4.3%
|
| 1 | One month or less | 21 |
14.9%
|
| 2 | 12 |
8.5%
|
|
| 3 | 39 |
27.7%
|
|
| 4 | 12 |
8.5%
|
|
| 5 | 6 |
4.3%
|
|
| 6 | 23 |
16.3%
|
|
| 7 | 1 |
0.7%
|
|
| 8 | 5 |
3.5%
|
|
| 10 | 1 |
0.7%
|
|
| 12 | 15 |
10.6%
|
|
| Sysmiss | 690 |