| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Not difficulty | 1500 | 1488 |
18.8%
|
| 2 | difficult | 85 | 70 |
0.9%
|
| 3 | Very difficult | 42 | 36 |
0.5%
|
| 88 | Not applicable | 6260 | 6294 |
79.7%
|
| 99 | Don't know | 3 | 3 |
0%
|
| Sysmiss | 8 | 9 |