| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2%
|
| 0 | None | 20 |
40%
|
| 1 | 8 |
16%
|
|
| 2 | 9 |
18%
|
|
| 3 | 2 |
4%
|
|
| 4 | 1 |
2%
|
|
| 5 | 1 |
2%
|
|
| 6 | 3 |
6%
|
|
| 8 | 1 |
2%
|
|
| 18 | 1 |
2%
|
|
| 23 | 1 |
2%
|
|
| 30 | 1 |
2%
|
|
| 50 | 1 |
2%
|
|
| Sysmiss | 550 |