| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 162136 |
97.2%
|
| 2 | Yes, some difficulty | 3148 |
1.9%
|
| 3 | Yes, a lot of difficulty | 1117 |
0.7%
|
| 4 | Cannot do at all | 350 |
0.2%
|
| Sysmiss | 21749 |