| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. totally useless | 0 |
0%
|
| 2 | 2. useless | 3 |
7.9%
|
| 3 | 3. sometimes useless, sometimes useful | 6 |
15.8%
|
| 4 | 4. useful | 19 |
50%
|
| 5 | 5. very useful | 8 |
21.1%
|
| 9 | 9. don't know | 2 |
5.3%
|
| Sysmiss | 61 |