| Value | Category | Cases | |
|---|---|---|---|
| 1 | rather useful | 140 |
70%
|
| 2 | very useful | 57 |
28.5%
|
| 3 | not very useful | 1 |
0.5%
|
| 4 | not useful at all | 2 |
1%
|
| Sysmiss | 564 |