| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
0.6%
|
| -7 | Does not apply (spontaneous) | 178 |
11.3%
|
| 1 | Good understanding | 1112 |
70.7%
|
| 2 | Average understanding | 245 |
15.6%
|
| 3 | Poor understanding | 28 |
1.8%
|