| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.8%
|
| 1 | One month or less | 2 |
0.9%
|
| 2 | 8 |
3.6%
|
|
| 3 | 10 |
4.4%
|
|
| 4 | 5 |
2.2%
|
|
| 5 | 1 |
0.4%
|
|
| 6 | 27 |
12%
|
|
| 7 | 1 |
0.4%
|
|
| 8 | 3 |
1.3%
|
|
| 9 | 1 |
0.4%
|
|
| 10 | 2 |
0.9%
|
|
| 11 | 2 |
0.9%
|
|
| 12 | 159 |
70.7%
|
|
| Sysmiss | 535 |