| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.No difficulty | 18871 |
77.4%
|
| 2 | b.Some difficulty | 766 |
3.1%
|
| 3 | c.A lot of difficulty | 310 |
1.3%
|
| 4 | d.Cannot do at all | 117 |
0.5%
|
| 5 | f.Don't know | 13 |
0.1%
|
| Missing value | 4295 |
17.6%
|