| Value | Category | Cases | |
|---|---|---|---|
| 1 | not so useful | 38 |
25%
|
| 2 | very useful | 15 |
9.9%
|
| 3 | rather useful | 95 |
62.5%
|
| 4 | not useful at all | 4 |
2.6%
|
| Sysmiss | 217 |