Table 7: Standardized Cronbach’s alphas for age.

SubscaleMean Cronbach’s alpha by age group
3–5 years old6–11 years old12–15 years oldGreater than 16 years old

Self-care0.91530.97000.91540.9459
Mobility0.95850.97800.95330.9731
Assuming a student's role—preschool/elementary school students0.98100.9942··
Assuming a student's role—secondary school students···0.9994
Expressing learning—students unable to use speech0.80180.9556··
Expressing learning—all students0.65450.8932·1.0000
Behavior0.89850.95130.99500.9439

(·) signifies 3 or fewer observations; therefore, Cronbach’s alpha is not computed.