| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 37 |
3%
|
| -7 | Does not apply | 47 |
3.8%
|
| 0 | No obstacle | 922 |
74.4%
|
| 1 | Minor obstacle | 75 |
6.1%
|
| 2 | Moderate obstacle | 63 |
5.1%
|
| 3 | Major obstacle | 49 |
4%
|
| 4 | Very severe obstacle | 46 |
3.7%
|