| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 42 |
16.7%
|
| 0 | None | 93 |
36.9%
|
| 1 | 24 |
9.5%
|
|
| 2 | 17 |
6.7%
|
|
| 3 | 3 |
1.2%
|
|
| 4 | 1 |
0.4%
|
|
| 5 | 22 |
8.7%
|
|
| 6 | 1 |
0.4%
|
|
| 8 | 1 |
0.4%
|
|
| 10 | 16 |
6.3%
|
|
| 15 | 3 |
1.2%
|
|
| 20 | 6 |
2.4%
|
|
| 25 | 4 |
1.6%
|
|
| 30 | 3 |
1.2%
|
|
| 40 | 3 |
1.2%
|
|
| 45 | 1 |
0.4%
|
|
| 50 | 8 |
3.2%
|
|
| 60 | 3 |
1.2%
|
|
| 70 | 1 |
0.4%
|
|
| Sysmiss | 461 |