| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
3.4%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 16 |
10.7%
|
| 1 | Minor obstacle | 58 |
38.9%
|
| 2 | Moderate obstacle | 31 |
20.8%
|
| 3 | Major obstacle | 21 |
14.1%
|
| 4 | Very severe obstacle | 18 |
12.1%
|