| Value | Category | Cases | |
|---|---|---|---|
| 1 | not so useful | 3 |
12.5%
|
| 2 | very useful | 14 |
58.3%
|
| 3 | rather useful | 6 |
25%
|
| 4 | not useful at all | 1 |
4.2%
|
| Sysmiss | 1 |