1 | Normal | 3 |
2 | Able to walk farther than 500 m, although it results in pain, tingling, and/or muscle weakness | 2 |
3 | Unable to walk farther than 500 m because of leg pain, tingling, and/or muscle weakness | 1 |
4 | Unable to walk farther than 100 m because of leg pain, tingling, and/or muscle weakness | 0 |