| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 154 |
48.1%
|
| 1 | Minor obstacle | 70 |
21.9%
|
| 2 | Moderate obstacle | 69 |
21.6%
|
| 3 | Major obstacle | 22 |
6.9%
|
| 4 | Very severe obstacle | 5 |
1.6%
|