| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 19 |
16%
|
| 1 | Increase | 55 |
46.2%
|
| 2 | Decrease | 19 |
16%
|
| 3 | Stay the same | 26 |
21.8%
|
| Sysmiss | 1 |