| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 8 |
15.7%
|
| 0 | 37 |
72.5%
|
|
| 2 | 1 |
2%
|
|
| 3 | 1 |
2%
|
|
| 5 | 1 |
2%
|
|
| 6 | 1 |
2%
|
|
| 7 | 1 |
2%
|
|
| 10 | 1 |
2%
|
|
| Sysmiss | 99 |