| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 165407 |
99.2%
|
| 2 | Yes, some difficulty | 802 |
0.5%
|
| 3 | Yes, a lot of difficulty | 318 |
0.2%
|
| 4 | Cannot do at all | 224 |
0.1%
|
| Sysmiss | 21749 |