| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.4%
|
| -7 | Does not apply | 3 |
2%
|
| 0 | No obstacle | 84 |
56.8%
|
| 1 | Minor obstacle | 42 |
28.4%
|
| 2 | Moderate obstacle | 14 |
9.5%
|
| 3 | Major obstacle | 3 |
2%
|
| 4 | Very severe obstacle | 0 |
0%
|