| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| -7 | Does not apply | 1 |
0.2%
|
| 0 | No obstacle | 241 |
41.3%
|
| 1 | Minor obstacle | 161 |
27.6%
|
| 2 | Moderate obstacle | 146 |
25%
|
| 3 | Major obstacle | 19 |
3.3%
|
| 4 | Very severe obstacle | 15 |
2.6%
|
| Sysmiss | 17 |