| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
1.6%
|
| -7 | Does not apply | 3 |
0.8%
|
| 0 | No obstacle | 107 |
29.4%
|
| 1 | Minor obstacle | 72 |
19.8%
|
| 2 | Moderate obstacle | 80 |
22%
|
| 3 | Major obstacle | 68 |
18.7%
|
| 4 | Very severe obstacle | 28 |
7.7%
|
| Sysmiss | 1 |