| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 5 |
4.2%
|
| 0 | No obstacle | 89 |
74.2%
|
| 1 | Minor obstacle | 8 |
6.7%
|
| 2 | Moderate obstacle | 14 |
11.7%
|
| 3 | Major obstacle | 2 |
1.7%
|
| 4 | Very severe obstacle | 2 |
1.7%
|