| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 34 |
5.1%
|
| -7 | Does not apply | 24 |
3.6%
|
| 0 | No obstacle | 80 |
12%
|
| 1 | Minor obstacle | 162 |
24.3%
|
| 2 | Moderate obstacle | 234 |
35.1%
|
| 3 | Major obstacle | 118 |
17.7%
|
| 4 | Very severe obstacle | 15 |
2.2%
|
| Sysmiss | 429 |