| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 1 |
2%
|
| 0 | 8 |
15.7%
|
|
| 1 | 12 |
23.5%
|
|
| 2 | 15 |
29.4%
|
|
| 3 | 8 |
15.7%
|
|
| 4 | 1 |
2%
|
|
| 6 | 2 |
3.9%
|
|
| 7 | 1 |
2%
|
|
| 10 | 1 |
2%
|
|
| 20 | 1 |
2%
|
|
| 50 | 1 |
2%
|
|
| Sysmiss | 189 |