| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
2%
|
| -7 | Does not apply | 17 |
11.4%
|
| 0 | No obstacle | 56 |
37.6%
|
| 1 | Minor obstacle | 30 |
20.1%
|
| 2 | Moderate obstacle | 22 |
14.8%
|
| 3 | Major obstacle | 16 |
10.7%
|
| 4 | Very severe obstacle | 5 |
3.4%
|