| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 26 |
78.8%
|
|
| 1 | 1 |
3%
|
|
| 3 | 2 |
6.1%
|
|
| 8 | 1 |
3%
|
|
| 10 | 1 |
3%
|
|
| 15 | 1 |
3%
|
|
| 21 | 1 |
3%
|
|
| Sysmiss | 118 |