| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.No difficulty | 10272 |
44.4%
|
| 2 | b.Some difficulty | 233 |
1%
|
| 3 | c.A lot of difficulty | 88 |
0.4%
|
| 4 | d.Cannot do at all | 21 |
0.1%
|
| Missing value | 12524 |
54.1%
|