| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
0.7%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 163 |
27.2%
|
| 1 | Minor obstacle | 163 |
27.2%
|
| 2 | Moderate obstacle | 248 |
41.3%
|
| 3 | Major obstacle | 20 |
3.3%
|
| 4 | Very severe obstacle | 2 |
0.3%
|
| Sysmiss | 1 |