| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 7 |
1.3%
|
| 1 | Increase | 12 |
2.3%
|
| 2 | Remain the same | 490 |
92.5%
|
| 3 | Decrease | 21 |
4%
|
| Sysmiss | 70 |