| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.9%
|
| 1 | One month or less | 17 |
14.9%
|
| 2 | 5 |
4.4%
|
|
| 3 | 14 |
12.3%
|
|
| 4 | 16 |
14%
|
|
| 5 | 10 |
8.8%
|
|
| 6 | 33 |
28.9%
|
|
| 7 | 10 |
8.8%
|
|
| 8 | 3 |
2.6%
|
|
| 11 | 1 |
0.9%
|
|
| 12 | 4 |
3.5%
|
|
| Sysmiss | 487 |