| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
2.1%
|
| -7 | Does not apply | 73 |
12.6%
|
| 0 | No obstacle | 423 |
72.9%
|
| 1 | Minor obstacle | 21 |
3.6%
|
| 2 | Moderate obstacle | 27 |
4.7%
|
| 3 | Major obstacle | 16 |
2.8%
|
| 4 | Very severe obstacle | 8 |
1.4%
|
| Sysmiss | 1 |