| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 5 |
0.3%
|
| 2 | SOME DIFFICULTY | 2 |
0.1%
|
| 4 | CANNOT WALK 100 M AT ALL | 3 |
0.2%
|
| Sysmiss | 1469 |
99.3%
|