| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 29 |
4.3%
|
| -7 | Does not apply | 18 |
2.7%
|
| 0 | No obstacle | 85 |
12.7%
|
| 1 | Minor obstacle | 147 |
22%
|
| 2 | Moderate obstacle | 221 |
33.1%
|
| 3 | Major obstacle | 146 |
21.9%
|
| 4 | Very severe obstacle | 21 |
3.1%
|
| Sysmiss | 429 |