| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
3.7%
|
| -7 | Does not apply | 45 |
12.8%
|
| 0 | No obstacle | 218 |
61.9%
|
| 1 | Minor obstacle | 25 |
7.1%
|
| 2 | Moderate obstacle | 17 |
4.8%
|
| 3 | Major obstacle | 13 |
3.7%
|
| 4 | Very severe obstacle | 21 |
6%
|