| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very easy | 3007 |
53.9%
|
| 2 | Easy | 1670 |
30%
|
| 3 | Difficult | 544 |
9.8%
|
| 4 | Very difficult | 75 |
1.3%
|
| 77 | Don't know/don't drink alcohol | 279 |
5%
|