| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 25 |
1.7%
|
| -7 | Does not apply | 60 |
4.2%
|
| 0 | No obstacle | 696 |
48.6%
|
| 1 | Minor obstacle | 202 |
14.1%
|
| 2 | Moderate obstacle | 210 |
14.7%
|
| 3 | Major obstacle | 168 |
11.7%
|
| 4 | Very severe obstacle | 71 |
5%
|