| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 28 |
27.7%
|
| 1 | Increased | 5 |
5%
|
| 2 | Remained the same | 43 |
42.6%
|
| 3 | Decreased | 25 |
24.8%
|
| Sysmiss | 124 |