| Value | Category | Cases | |
|---|---|---|---|
| 1 | some difficulty | 52 |
0.2%
|
| 2 | a lot of difficulty | 47 |
0.2%
|
| 3 | cannot do at all | 15 |
0.1%
|
| 98 | don't know | 0 |
0%
|
| 99 | refuse to answer | 0 |
0%
|
| Missing value | 21978 |
99.5%
|