| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.No difficulty | 84 |
0.4%
|
| 2 | b.Some difficulty | 127 |
0.5%
|
| 3 | c.A lot of difficulty | 63 |
0.3%
|
| 4 | d.Cannot do at all | 2 |
0%
|
| Missing value | 22862 |
98.8%
|