| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
2%
|
| -7 | Does not apply | 5 |
1.4%
|
| 0 | No obstacle | 275 |
78.3%
|
| 1 | Minor obstacle | 44 |
12.5%
|
| 2 | Moderate obstacle | 14 |
4%
|
| 3 | Major obstacle | 4 |
1.1%
|
| 4 | Very severe obstacle | 2 |
0.6%
|