| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Not difficulty | 5266 | 5360 |
67.9%
|
| 2 | difficult | 424 | 392 |
5%
|
| 3 | Very difficult | 52 | 49 |
0.6%
|
| 88 | Not applicable | 2145 | 2086 |
26.4%
|
| 99 | Don't know | 4 | 4 |
0%
|
| Sysmiss | 7 | 8 |