| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
2%
|
| -7 | Does not apply | 9 |
6%
|
| 0 | No obstacle | 66 |
44.3%
|
| 1 | Minor obstacle | 34 |
22.8%
|
| 2 | Moderate obstacle | 16 |
10.7%
|
| 3 | Major obstacle | 19 |
12.8%
|
| 4 | Very severe obstacle | 2 |
1.3%
|