| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 5829 |
70.7%
|
| 2 | Minor difficult | 818 |
9.9%
|
| 3 | Big difficulty | 1472 |
17.9%
|
| 8 | NA | 104 | |
| 9 | I don’t know | 4 | |
| Sysmiss | 17 |