| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 6 |
3.3%
|
| 1 | Increased | 31 |
17.1%
|
| 2 | Remained the same | 73 |
40.3%
|
| 3 | Decreased | 71 |
39.2%
|
| Sysmiss | 178 |