| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 230 |
38.3%
|
| 1 | Minor obstacle | 110 |
18.3%
|
| 2 | Moderate obstacle | 109 |
18.2%
|
| 3 | Major obstacle | 93 |
15.5%
|
| 4 | Very severe obstacle | 58 |
9.7%
|
| Sysmiss | 600 |