| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 1 | very easy | 1084 |
2%
|
| 2 | easy | 2515 |
4.7%
|
| 3 | difficult | 1768 |
3.3%
|
| 4 | very difficult | 1458 |
2.7%
|
| 7 | not applicable | 46610 |
87.2%
|
| 8 | refused | 0 |
0%
|
| 9 | don't know | 9 |
0%
|