| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.No difficulty | 10552 |
45.6%
|
| 2 | b.Some difficulty | 484 |
2.1%
|
| 3 | c.A lot of difficulty | 146 |
0.6%
|
| 4 | d.Cannot do at all | 33 |
0.1%
|
| Missing value | 11923 |
51.5%
|