| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not useful | 1 |
1.2%
|
| 2 | Fairly useful | 19 |
23.5%
|
| 3 | Useful | 48 |
59.3%
|
| 4 | Very useful | 13 |
16%
|
| Sysmiss | 510 |