| Value | Category | Cases | |
|---|---|---|---|
| -9999 | inapplicable | 0 |
0%
|
| -3 | non-response | 0 |
0%
|
| -2 | non response | 44 |
0.3%
|
| -1 | non response | 0 |
0%
|
| 1 | easily | 8217 |
63.2%
|
| 2 | after several attempts | 2576 |
19.8%
|
| 3 | with difficulty | 2166 |
16.7%
|