| Value | Category | Cases | |
|---|---|---|---|
| 1 | not so useful | 54 |
18.2%
|
| 2 | very useful | 18 |
6.1%
|
| 3 | rather useful | 222 |
75%
|
| 4 | not useful at all | 2 |
0.7%
|
| Sysmiss | 400 |