| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.3%
|
| -7 | Does not apply | 1 |
0.3%
|
| 0 | No obstacle | 271 |
74.5%
|
| 1 | Minor obstacle | 52 |
14.3%
|
| 2 | Moderate obstacle | 28 |
7.7%
|
| 3 | Major obstacle | 7 |
1.9%
|
| 4 | Very severe obstacle | 4 |
1.1%
|
| Sysmiss | 1 |