| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 0 | No obstacle | 217 |
36.2%
|
| 1 | Minor obstacle | 167 |
27.8%
|
| 2 | Moderate obstacle | 88 |
14.7%
|
| 3 | Major obstacle | 68 |
11.3%
|
| 4 | Very severe obstacle | 60 |
10%
|