| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 22 |
8.1%
|
| -7 | Does not apply | 5 |
1.8%
|
| 0 | No obstacle | 54 |
19.9%
|
| 1 | Minor obstacle | 45 |
16.6%
|
| 2 | Moderate obstacle | 61 |
22.5%
|
| 3 | Major obstacle | 46 |
17%
|
| 4 | Very severe obstacle | 38 |
14%
|