| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 9 |
8.9%
|
| 1 | Increased | 5 |
5%
|
| 2 | Remained the same | 16 |
15.8%
|
| 3 | Decreased | 71 |
70.3%
|
| Sysmiss | 124 |