| Value | Category | Cases | |
|---|---|---|---|
| 1 | Yes, it is essential | 992 |
72.8%
|
| 2 | Yes, but not essential | 141 |
10.3%
|
| 3 | No, it is not useful | 95 |
7%
|
| 4 | Other | 135 |
9.9%
|
| Sysmiss | 118 |