| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
1.4%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 127 |
35.2%
|
| 1 | Minor obstacle | 51 |
14.1%
|
| 2 | Moderate obstacle | 87 |
24.1%
|
| 3 | Major obstacle | 56 |
15.5%
|
| 4 | Very severe obstacle | 35 |
9.7%
|