| Value | Category | Cases | |
|---|---|---|---|
| 1 | not so useful | 165 |
14.6%
|
| 2 | very useful | 90 |
8%
|
| 3 | rather useful | 855 |
75.7%
|
| 4 | not useful at all | 19 |
1.7%
|
| Sysmiss | 1405 |