| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 18 |
1.1%
|
| 2 | SOME DIFFICULTY | 2 |
0.1%
|
| 4 | CANNOT WALK 100 M/Y AT ALL | 1 |
0.1%
|
| Sysmiss | 1645 |
98.7%
|