| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.2%
|
| -7 | Does not apply | 7 |
0.7%
|
| 0 | No obstacle | 345 |
32.5%
|
| 1 | Minor obstacle | 389 |
36.6%
|
| 2 | Moderate obstacle | 274 |
25.8%
|
| 3 | Major obstacle | 34 |
3.2%
|
| 4 | Very severe obstacle | 11 |
1%
|
| Sysmiss | 1007 |