| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 2 |
0.6%
|
| 1 | Increase | 10 |
2.9%
|
| 2 | Remain the same | 164 |
47.7%
|
| 3 | Decrease | 168 |
48.8%
|
| Sysmiss | 33 |