| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 12 |
1.3%
|
| 0 | No obstacle | 258 |
27.2%
|
| 1 | Minor obstacle | 214 |
22.6%
|
| 2 | Moderate obstacle | 246 |
26%
|
| 3 | Major obstacle | 172 |
18.2%
|
| 4 | Very severe obstacle | 45 |
4.8%
|