| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.3%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 61 |
40.4%
|
| 1 | Minor obstacle | 32 |
21.2%
|
| 2 | Moderate obstacle | 37 |
24.5%
|
| 3 | Major obstacle | 16 |
10.6%
|
| 4 | Very severe obstacle | 3 |
2%
|