| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.4%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 106 |
43.8%
|
| 1 | Minor obstacle | 43 |
17.8%
|
| 2 | Moderate obstacle | 60 |
24.8%
|
| 3 | Major obstacle | 26 |
10.7%
|
| 4 | Very severe obstacle | 6 |
2.5%
|