| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Higher than usual | 66 |
68%
|
| 2 | Lower than usual | 4 |
4.1%
|
| 3 | The usual | 27 |
27.8%
|
| Sysmiss | 38 |