| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 |
3.1%
|
| -7 | Does not apply | 42 |
11.9%
|
| 0 | No obstacle | 241 |
68.5%
|
| 1 | Minor obstacle | 13 |
3.7%
|
| 2 | Moderate obstacle | 7 |
2%
|
| 3 | Major obstacle | 11 |
3.1%
|
| 4 | Very severe obstacle | 27 |
7.7%
|