| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 1 |
0.2%
|
| 0 | No obstacle | 213 |
36.5%
|
| 1 | Minor obstacle | 131 |
22.4%
|
| 2 | Moderate obstacle | 168 |
28.8%
|
| 3 | Major obstacle | 50 |
8.6%
|
| 4 | Very severe obstacle | 21 |
3.6%
|
| Sysmiss | 17 |