| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
1.4%
|
| -7 | Does not apply | 4 |
1.1%
|
| 0 | No obstacle | 168 |
46.9%
|
| 1 | Minor obstacle | 111 |
31%
|
| 2 | Moderate obstacle | 49 |
13.7%
|
| 3 | Major obstacle | 17 |
4.7%
|
| 4 | Very severe obstacle | 4 |
1.1%
|