| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 164217 |
98.5%
|
| 2 | Yes, some difficulty | 1956 |
1.2%
|
| 3 | Yes, a lot of difficulty | 280 |
0.2%
|
| 4 | Cannot do at all | 247 |
0.1%
|
| Sysmiss | 21800 |