| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.3%
|
| -7 | Does not apply | 4 |
2.7%
|
| 0 | No obstacle | 68 |
45.6%
|
| 1 | Minor obstacle | 40 |
26.8%
|
| 2 | Moderate obstacle | 18 |
12.1%
|
| 3 | Major obstacle | 9 |
6%
|
| 4 | Very severe obstacle | 8 |
5.4%
|