| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 1 |
0.3%
|
| 0 | No obstacle | 187 |
51.9%
|
| 1 | Minor obstacle | 37 |
10.3%
|
| 2 | Moderate obstacle | 34 |
9.4%
|
| 3 | Major obstacle | 40 |
11.1%
|
| 4 | Very severe obstacle | 61 |
16.9%
|