| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.7%
|
| -7 | Does not apply | 9 |
6%
|
| 0 | No obstacle | 86 |
57.7%
|
| 1 | Minor obstacle | 30 |
20.1%
|
| 2 | Moderate obstacle | 12 |
8.1%
|
| 3 | Major obstacle | 6 |
4%
|
| 4 | Very severe obstacle | 5 |
3.4%
|