| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 89 |
59.3%
|
| 1 | Minor obstacle | 29 |
19.3%
|
| 2 | Moderate obstacle | 9 |
6%
|
| 3 | Major obstacle | 10 |
6.7%
|
| 4 | Very severe obstacle | 13 |
8.7%
|