| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 4 |
2%
|
| 1 | Increase | 17 |
8.5%
|
| 2 | Remain the same | 66 |
33.2%
|
| 3 | Decrease | 112 |
56.3%
|
| Sysmiss | 146 |