Figure Percent change in average velocity for each minute during the Six-Minute Walk Test

Percent change in average velocity for each minute compared with the average velocity walked in the first minute during the Six-Minute Walk Test (6MWT) for spinal muscular atrophy (SMA) types 3a and 3b. The average velocity for each minute walked during the 6MWT decreased when compared with the average velocity walked in the first minute for participants with type 3a and 3b. Participants with SMA type 3a had slower average velocities at each minute.