| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 41 |
2.6%
|
| -7 | Does not apply (spontaneous) | 263 |
16.7%
|
| 1 | Good understanding | 808 |
51.4%
|
| 2 | Average understanding | 328 |
20.9%
|
| 3 | Poor understanding | 133 |
8.5%
|