| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Higher than usual | 19 |
17.1%
|
| 2 | Lower than usual | 32 |
28.8%
|
| 3 | The usual | 60 |
54.1%
|