| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
1.9%
|
| -7 | Does not apply | 5 |
1.9%
|
| 0 | No obstacle | 138 |
53.3%
|
| 1 | Minor obstacle | 50 |
19.3%
|
| 2 | Moderate obstacle | 21 |
8.1%
|
| 3 | Major obstacle | 22 |
8.5%
|
| 4 | Very severe obstacle | 18 |
6.9%
|