| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 1 |
0.7%
|
| 0 | No obstacle | 38 |
25.3%
|
| 1 | Minor obstacle | 46 |
30.7%
|
| 2 | Moderate obstacle | 25 |
16.7%
|
| 3 | Major obstacle | 28 |
18.7%
|
| 4 | Very severe obstacle | 12 |
8%
|