| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
1.2%
|
| -7 | Does not apply | 62 |
10.4%
|
| 0 | No obstacle | 372 |
62.2%
|
| 1 | Minor obstacle | 117 |
19.6%
|
| 2 | Moderate obstacle | 24 |
4%
|
| 3 | Major obstacle | 11 |
1.8%
|
| 4 | Very severe obstacle | 5 |
0.8%
|