| MILD (IQ 50 to 69): Capable of personal independence with a little guidance and assistance. |
| MODERATE (IQ 35 to 49): Require assistance with more complex activities; communicate with simple sentences. |
| SEVERE (IQ 20 to 34): Require assistance with most ADLs; communicate with words and gestures. |
| PROFOUND (IQ <20): Require comprehensive care and assistance; usually non-verbal; high incidence of secondary disabilities. |
