| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 182 |
37.9%
|
| 1 | Minor obstacle | 139 |
29%
|
| 2 | Moderate obstacle | 71 |
14.8%
|
| 3 | Major obstacle | 58 |
12.1%
|
| 4 | Very severe obstacle | 30 |
6.3%
|