| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 86 |
34.4%
|
| 1 | Minor obstacle | 30 |
12%
|
| 2 | Moderate obstacle | 65 |
26%
|
| 3 | Major obstacle | 66 |
26.4%
|
| 4 | Very severe obstacle | 3 |
1.2%
|