| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
5.1%
|
| 1 | Higher than usual | 6 |
15.4%
|
| 2 | Lower than usual | 3 |
7.7%
|
| 3 | The usual | 28 |
71.8%
|
| Sysmiss | 72 |