| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 1 |
0.4%
|
| -9 | Don't know (spontaneous) | 6 |
2.1%
|
| 1 | Increase | 111 |
39.1%
|
| 2 | Remain the same | 119 |
41.9%
|
| 3 | Decrease | 47 |
16.5%
|
| Sysmiss | 76 |