| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 195 |
32.9%
|
| 1 | Minor obstacle | 41 |
6.9%
|
| 2 | Moderate obstacle | 79 |
13.3%
|
| 3 | Major obstacle | 116 |
19.6%
|
| 4 | Very severe obstacle | 161 |
27.2%
|