| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 2624 |
26.4%
|
| 2 | Minor difficulty | 650 |
6.5%
|
| 3 | Big difficulty | 650 |
6.5%
|
| 8 | Not applicable | 5894 |
59.4%
|
| 9 | Don’t know | 101 |
1%
|
| Sysmiss | 7 |