| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
2%
|
| -7 | Does not apply | 72 |
20.1%
|
| 0 | No obstacle | 169 |
47.2%
|
| 1 | Minor obstacle | 46 |
12.8%
|
| 2 | Moderate obstacle | 35 |
9.8%
|
| 3 | Major obstacle | 25 |
7%
|
| 4 | Very severe obstacle | 4 |
1.1%
|