| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
7.1%
|
| 0 | None | 53 |
62.4%
|
| 1 | 10 |
11.8%
|
|
| 2 | 4 |
4.7%
|
|
| 3 | 2 |
2.4%
|
|
| 5 | 3 |
3.5%
|
|
| 6 | 1 |
1.2%
|
|
| 7 | 1 |
1.2%
|
|
| 10 | 4 |
4.7%
|
|
| 20 | 1 |
1.2%
|
|
| Sysmiss | 515 |