| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 7 |
70%
|
| 2 | Some difficulty | 1 |
10%
|
| 3 | A lot of difficulty | 0 |
0%
|
| 4 | Cannot walk at all | 2 |
20%
|
| 9 | Missing | 0 |
0%
|
| Sysmiss | 1113 |