Value | Category | Cases | |
---|---|---|---|
-1 | missing | 0 |
0%
|
1 | very easy | 3998 |
8.3%
|
2 | easy | 10974 |
22.8%
|
3 | difficult | 8784 |
18.3%
|
4 | very difficult | 5483 |
11.4%
|
7 | not applicable | 18811 |
39.1%
|
8 | refused | 2 |
0%
|
9 | don't know | 32 |
0.1%
|