| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 |
7.2%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 45 |
40.5%
|
| 1 | Minor obstacle | 27 |
24.3%
|
| 2 | Moderate obstacle | 13 |
11.7%
|
| 3 | Major obstacle | 15 |
13.5%
|
| 4 | Very severe obstacle | 3 |
2.7%
|