Category	Definition
0. Nonfunctional ambulation	Patient cannot ambulate, ambulates in parallel bars only, or requires supervision or physical assistance from more than one person to ambulate safely outside of parallel bars.
1. Ambulator—dependent for physical assistance, level II	Patient requires manual contact of no more than one person during ambulation on level surfaces to prevent falling. Manual contact is continuous and necessary to support body weight as well as maintain balance and/or assist coordination.
2. Ambulator—dependent for physical assistance, level I	Patient requires manual contact of no more than one person during ambulation on level surfaces to prevent falling. Manual contact consists of continuous or intermittent light touch to assist balance or coordination.
3. Ambulator—dependent for supervision	Patient can physically ambulate on level surfaces without manual contact of another person, but for safety requires standby guarding of no more than one person because of poor judgment, questionable cardiac status, or the need for verbal cuing to complete the task.
4. Ambulator—independent on level surfaces only	Patient can ambulate independently on level surfaces but requires supervision or physical assistance to negotiate stairs, inclines, or nonlevel surfaces.
5. Ambulator—independent	Patient can ambulate independently on nonlevel and level surfaces, stairs, and inclines, without supervision or physical assistance from another person. Assistive devices, orthoses, and prostheses are allowed.