
Subscale  Mean Cronbach’s alpha by age group 
3–5 years old  6–11 years old  12–15 years old  Greater than 16 years old 

Selfcare  0.9153  0.9700  0.9154  0.9459 
Mobility  0.9585  0.9780  0.9533  0.9731 
Assuming a student's role—preschool/elementary school students  0.9810  0.9942  ·  · 
Assuming a student's role—secondary school students  ·  ·  ·  0.9994 
Expressing learning—students unable to use speech  0.8018  0.9556  ·  · 
Expressing learning—all students  0.6545  0.8932  ·  1.0000 
Behavior  0.8985  0.9513  0.9950  0.9439 
