| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.No difficulty | 13805 |
86.2%
|
| 2 | b.Some difficulty | 1076 |
6.7%
|
| 3 | c.A lot of difficulty | 307 |
1.9%
|
| 4 | d.Cannot do at all | 22 |
0.1%
|
| Missing value | 796 |
5%
|