| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 50 |
11.4%
|
| 0 | None | 193 |
44.1%
|
| 1 | 61 |
13.9%
|
|
| 2 | 40 |
9.1%
|
|
| 3 | 17 |
3.9%
|
|
| 4 | 3 |
0.7%
|
|
| 5 | 28 |
6.4%
|
|
| 6 | 2 |
0.5%
|
|
| 7 | 1 |
0.2%
|
|
| 8 | 1 |
0.2%
|
|
| 9 | 1 |
0.2%
|
|
| 10 | 25 |
5.7%
|
|
| 15 | 6 |
1.4%
|
|
| 20 | 4 |
0.9%
|
|
| 25 | 2 |
0.5%
|
|
| 30 | 3 |
0.7%
|
|
| 50 | 1 |
0.2%
|
|
| Sysmiss | 1225 |