| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 39 |
37.9%
|
| 1 | Minor obstacle | 16 |
15.5%
|
| 2 | Moderate obstacle | 24 |
23.3%
|
| 3 | Major obstacle | 14 |
13.6%
|
| 4 | Very severe obstacle | 9 |
8.7%
|