| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.No difficulty | 13476 |
84.2%
|
| 2 | b.Some difficulty | 229 |
1.4%
|
| 3 | c.A lot of difficulty | 84 |
0.5%
|
| 4 | d.Cannot do at all | 33 |
0.2%
|
| Missing value | 2184 |
13.6%
|