| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 49 |
18.1%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 53 |
19.6%
|
| 1 | Minor obstacle | 35 |
12.9%
|
| 2 | Moderate obstacle | 54 |
19.9%
|
| 3 | Major obstacle | 57 |
21%
|
| 4 | Very severe obstacle | 23 |
8.5%
|