| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 131 |
36.3%
|
| 1 | Minor obstacle | 107 |
29.6%
|
| 2 | Moderate obstacle | 78 |
21.6%
|
| 3 | Major obstacle | 38 |
10.5%
|
| 4 | Very severe obstacle | 7 |
1.9%
|