| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
0.6%
|
| -7 | Does not apply (spontaneous) | 3 |
0.2%
|
| 1 | Good understanding | 1296 |
82.4%
|
| 2 | Average understanding | 247 |
15.7%
|
| 3 | Poor understanding | 18 |
1.1%
|