| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
1.1%
|
| -7 | Does not apply (spontaneous) | 9 |
1.7%
|
| 1 | Not at all useful | 26 |
4.9%
|
| 2 | Not very useful | 60 |
11.3%
|
| 3 | Somewhat useful | 179 |
33.8%
|
| 4 | Very useful | 249 |
47.1%
|
| Sysmiss | 466 |