| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 1110 |
50.4%
|
| 2 | Minor difficult | 77 |
3.5%
|
| 3 | Big difficulty | 41 |
1.9%
|
| 8 | NA | 10 |
0.5%
|
| 9 | I don’t know | 10 |
0.5%
|
| Sysmiss | 956 |