| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 3 |
0.8%
|
| 0 | No obstacle | 185 |
51.7%
|
| 1 | Minor obstacle | 73 |
20.4%
|
| 2 | Moderate obstacle | 57 |
15.9%
|
| 3 | Major obstacle | 24 |
6.7%
|
| 4 | Very severe obstacle | 16 |
4.5%
|