| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
8.1%
|
| -7 | Does not apply | 3 |
2.7%
|
| 0 | No obstacle | 42 |
37.8%
|
| 1 | Minor obstacle | 29 |
26.1%
|
| 2 | Moderate obstacle | 13 |
11.7%
|
| 3 | Major obstacle | 10 |
9%
|
| 4 | Very severe obstacle | 5 |
4.5%
|