| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 56 |
1.8%
|
| -7 | Does not apply (spontaneous) | 218 |
6.8%
|
| 1 | Increased | 258 |
8.1%
|
| 2 | Remained the Same | 2430 |
76.3%
|
| 3 | Decreased | 221 |
6.9%
|
| Sysmiss | 592 |