| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
1.4%
|
| -7 | Does not apply | 1 |
0.3%
|
| 0 | No obstacle | 291 |
79.9%
|
| 1 | Minor obstacle | 36 |
9.9%
|
| 2 | Moderate obstacle | 24 |
6.6%
|
| 3 | Major obstacle | 4 |
1.1%
|
| 4 | Very severe obstacle | 3 |
0.8%
|
| Sysmiss | 1 |