| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3 |
100%
|
| 2 | Some difficulty | 0 |
0%
|
| 3 | A lot of difficulty | 0 |
0%
|
| 4 | Cannot walk at all | 0 |
0%
|
| 9 | Missing | 0 |
0%
|
| Sysmiss | 376 |