| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 99 |
3.4%
|
| -7 | Does not apply | 349 |
11.8%
|
| 0 | No obstacle | 1463 |
49.5%
|
| 1 | Minor obstacle | 543 |
18.4%
|
| 2 | Moderate obstacle | 360 |
12.2%
|
| 3 | Major obstacle | 118 |
4%
|
| 4 | Very severe obstacle | 23 |
0.8%
|