| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
1.4%
|
| -7 | Does not apply | 13 |
3.7%
|
| 0 | No obstacle | 168 |
47.7%
|
| 1 | Minor obstacle | 47 |
13.4%
|
| 2 | Moderate obstacle | 74 |
21%
|
| 3 | Major obstacle | 26 |
7.4%
|
| 4 | Very severe obstacle | 19 |
5.4%
|