| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not necessary at all | 2 |
2.6%
|
| 3 | 1 |
1.3%
|
|
| 4 | 3 |
3.9%
|
|
| 5 | 3 |
3.9%
|
|
| 6 | 6 |
7.8%
|
|
| 7 | 11 |
14.3%
|
|
| 8 | 10 |
13%
|
|
| 9 | 17 |
22.1%
|
|
| 10 | Extremely necessary | 24 |
31.2%
|
| Sysmiss | 8 |