| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.No difficulty | 10929 |
47.2%
|
| 2 | b.Some difficulty | 200 |
0.9%
|
| 3 | c.A lot of difficulty | 63 |
0.3%
|
| 4 | d.Cannot do at all | 23 |
0.1%
|
| Missing value | 11923 |
51.5%
|