| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 2 |
1%
|
| 1 | Increased | 40 |
20.9%
|
| 2 | Remained the same | 105 |
55%
|
| 3 | Decreased | 44 |
23%
|
| Sysmiss | 154 |