| Value | Category | Cases | |
|---|---|---|---|
| -9 | do not know | 11 |
4.6%
|
| -7 | does not apply | 3 |
1.2%
|
| 0 | no obstacle | 171 |
71%
|
| 1 | minor obstacle | 24 |
10%
|
| 2 | moderate obstacle | 14 |
5.8%
|
| 3 | major obstacle | 9 |
3.7%
|
| 4 | very severe obstacle | 9 |
3.7%
|