| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
6.7%
|
| 1 | Increased | 5 |
11.1%
|
| 2 | Decreased | 14 |
31.1%
|
| 3 | No change | 23 |
51.1%
|
| Sysmiss | 3730 |