| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
25%
|
| -4 | Too many to count | 2 |
25%
|
| 2 | 1 |
12.5%
|
|
| 3 | 1 |
12.5%
|
|
| 5 | 2 |
25%
|
|
| Sysmiss | 141 |