| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 10 |
2.7%
|
| 0 | No obstacle | 257 |
70.6%
|
| 1 | Minor obstacle | 47 |
12.9%
|
| 2 | Moderate obstacle | 37 |
10.2%
|
| 3 | Major obstacle | 11 |
3%
|
| 4 | Very severe obstacle | 2 |
0.5%
|
| Sysmiss | 1 |