| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.5%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 124 |
34.1%
|
| 1 | Minor obstacle | 47 |
12.9%
|
| 2 | Moderate obstacle | 76 |
20.9%
|
| 3 | Major obstacle | 95 |
26.1%
|
| 4 | Very severe obstacle | 20 |
5.5%
|
| Sysmiss | 1 |