| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. totally useless | 0 |
0%
|
| 2 | 2. useless | 2 |
5.6%
|
| 3 | 3. sometimes useless, sometimes useful | 4 |
11.1%
|
| 4 | 4. useful | 21 |
58.3%
|
| 5 | 5. very useful | 8 |
22.2%
|
| 9 | 9. don't know | 1 |
2.8%
|
| Sysmiss | 63 |