| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
6.9%
|
| 1 | Increased | 45 |
62.5%
|
| 2 | Decreased | 4 |
5.6%
|
| 3 | Remained the same | 18 |
25%
|
| Sysmiss | 77 |