| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.4%
|
| -7 | Does not apply | 2 |
0.8%
|
| 0 | No obstacle | 71 |
27.1%
|
| 1 | Minor obstacle | 34 |
13%
|
| 2 | Moderate obstacle | 50 |
19.1%
|
| 3 | Major obstacle | 49 |
18.7%
|
| 4 | Very severe obstacle | 55 |
21%
|
| Sysmiss | 339 |