| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| -7 | Does not apply | 5 |
0.8%
|
| 0 | No obstacle | 277 |
46.2%
|
| 1 | Minor obstacle | 126 |
21%
|
| 2 | Moderate obstacle | 88 |
14.7%
|
| 3 | Major obstacle | 62 |
10.3%
|
| 4 | Very severe obstacle | 41 |
6.8%
|
| Sysmiss | 600 |