| Value | Category | Cases | |
|---|---|---|---|
| 1 | Easily | 1070 |
21.8%
|
| 2 | With difficulty | 245 |
5%
|
| 3 | Not at all | 3544 |
72.2%
|
| 7 | Missing | 41 |
0.8%
|
| 9 | Don't know | 6 |
0.1%
|