| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.3%
|
| -7 | Does not apply | 3 |
0.8%
|
| 0 | No obstacle | 148 |
40.7%
|
| 1 | Minor obstacle | 79 |
21.7%
|
| 2 | Moderate obstacle | 84 |
23.1%
|
| 3 | Major obstacle | 44 |
12.1%
|
| 4 | Very severe obstacle | 5 |
1.4%
|
| Sysmiss | 1 |