| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.No difficulty | 12260 |
76.6%
|
| 2 | b.Some difficulty | 1137 |
7.1%
|
| 3 | c.A lot of difficulty | 369 |
2.3%
|
| 4 | d.Cannot do at all | 56 |
0.3%
|
| Missing value | 2184 |
13.6%
|