| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
2.2%
|
| 1 | One month or less | 8 |
9%
|
| 2 | 16 |
18%
|
|
| 3 | 30 |
33.7%
|
|
| 4 | 12 |
13.5%
|
|
| 5 | 4 |
4.5%
|
|
| 6 | 11 |
12.4%
|
|
| 8 | 1 |
1.1%
|
|
| 9 | 1 |
1.1%
|
|
| 10 | 1 |
1.1%
|
|
| 12 | 3 |
3.4%
|
|
| Sysmiss | 271 |