| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 57 |
12.8%
|
| 1 | Increased | 9 |
2%
|
| 2 | Remained the same | 201 |
45%
|
| 3 | Decreased | 180 |
40.3%
|
| Sysmiss | 154 |