| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
2%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 21 |
13.9%
|
| 1 | Minor obstacle | 38 |
25.2%
|
| 2 | Moderate obstacle | 51 |
33.8%
|
| 3 | Major obstacle | 25 |
16.6%
|
| 4 | Very severe obstacle | 13 |
8.6%
|