| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 124 |
49.6%
|
| 1 | Minor obstacle | 83 |
33.2%
|
| 2 | Moderate obstacle | 34 |
13.6%
|
| 3 | Major obstacle | 9 |
3.6%
|
| 4 | Very severe obstacle | 0 |
0%
|