| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.No difficulty | 8191 |
35.4%
|
| 2 | b.Some difficulty | 123 |
0.5%
|
| 3 | c.A lot of difficulty | 40 |
0.2%
|
| 4 | d.Cannot do at all | 53 |
0.2%
|
| Missing value | 14731 |
63.7%
|