| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
10%
|
| 1 | One month or less | 9 |
9%
|
| 2 | 5 |
5%
|
|
| 3 | 10 |
10%
|
|
| 4 | 10 |
10%
|
|
| 5 | 6 |
6%
|
|
| 6 | 9 |
9%
|
|
| 7 | 4 |
4%
|
|
| 8 | 21 |
21%
|
|
| 9 | 1 |
1%
|
|
| 10 | 2 |
2%
|
|
| 11 | 3 |
3%
|
|
| 12 | 10 |
10%
|
|
| Sysmiss | 252 |