| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 8 |
2.3%
|
| 1 | Increase | 30 |
8.7%
|
| 2 | Remain the same | 88 |
25.6%
|
| 3 | Decrease | 218 |
63.4%
|
| Sysmiss | 33 |