| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
2%
|
| -7 | Does not apply | 13 |
3.8%
|
| 0 | No obstacle | 82 |
23.8%
|
| 1 | Minor obstacle | 56 |
16.2%
|
| 2 | Moderate obstacle | 70 |
20.3%
|
| 3 | Major obstacle | 56 |
16.2%
|
| 4 | Very severe obstacle | 61 |
17.7%
|