| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 165787 |
99.4%
|
| 2 | Yes, some difficulty | 578 |
0.3%
|
| 3 | Yes, a lot of difficulty | 237 |
0.1%
|
| 4 | Cannot do at all | 149 |
0.1%
|
| Sysmiss | 21749 |