| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.7%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 30 |
19.9%
|
| 1 | Minor obstacle | 33 |
21.9%
|
| 2 | Moderate obstacle | 25 |
16.6%
|
| 3 | Major obstacle | 58 |
38.4%
|
| 4 | Very severe obstacle | 4 |
2.6%
|