| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 41 |
11.4%
|
| 0 | No obstacle | 98 |
27.2%
|
| 1 | Minor obstacle | 46 |
12.8%
|
| 2 | Moderate obstacle | 83 |
23.1%
|
| 3 | Major obstacle | 72 |
20%
|
| 4 | Very severe obstacle | 20 |
5.6%
|