| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
1.9%
|
| -7 | Does not apply | 9 |
2.4%
|
| 0 | No obstacle | 139 |
37.1%
|
| 1 | Minor obstacle | 70 |
18.7%
|
| 2 | Moderate obstacle | 63 |
16.8%
|
| 3 | Major obstacle | 44 |
11.7%
|
| 4 | Very severe obstacle | 43 |
11.5%
|