| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 38 |
63.3%
|
| 1 | Increased | 2 |
3.3%
|
| 2 | Remained the same | 8 |
13.3%
|
| 3 | Decreased | 12 |
20%
|
| Sysmiss | 541 |