| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 8 |
4%
|
| 1 | Increase | 8 |
4%
|
| 2 | Remain the same | 84 |
42.2%
|
| 3 | Decrease | 99 |
49.7%
|
| Sysmiss | 146 |