| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
1.2%
|
| -7 | Does not apply | 14 |
2.3%
|
| 0 | No obstacle | 228 |
38%
|
| 1 | Minor obstacle | 114 |
19%
|
| 2 | Moderate obstacle | 89 |
14.8%
|
| 3 | Major obstacle | 78 |
13%
|
| 4 | Very severe obstacle | 70 |
11.7%
|