| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 |
4.2%
|
| -7 | Does not apply | 17 |
4.8%
|
| 0 | No obstacle | 158 |
44.6%
|
| 1 | Minor obstacle | 32 |
9%
|
| 2 | Moderate obstacle | 62 |
17.5%
|
| 3 | Major obstacle | 47 |
13.3%
|
| 4 | Very severe obstacle | 23 |
6.5%
|