| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 15 |
13.2%
|
| 0 | No obstacle | 52 |
45.6%
|
| 1 | Minor obstacle | 19 |
16.7%
|
| 2 | Moderate obstacle | 17 |
14.9%
|
| 3 | Major obstacle | 6 |
5.3%
|
| 4 | Very severe obstacle | 5 |
4.4%
|