| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.7%
|
| -7 | Does not apply | 2 |
1.7%
|
| 0 | No obstacle | 49 |
40.8%
|
| 1 | Minor obstacle | 19 |
15.8%
|
| 2 | Moderate obstacle | 20 |
16.7%
|
| 3 | Major obstacle | 15 |
12.5%
|
| 4 | Very severe obstacle | 13 |
10.8%
|