| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 21 |
2%
|
| -7 | Does not apply | 85 |
8.3%
|
| 0 | No obstacle | 606 |
58.9%
|
| 1 | Minor obstacle | 168 |
16.3%
|
| 2 | Moderate obstacle | 76 |
7.4%
|
| 3 | Major obstacle | 59 |
5.7%
|
| 4 | Very severe obstacle | 13 |
1.3%
|