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Mean Language Scores and Non-Verbal Intelligence (I.Q.) Scores for Specified Groups of Children at 6 Years of Age

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Chart created by the NIDCD Epidemiology and Statistics Program.

This figure displays language scores and intelligence quotients (I.Q. scores) for four groups of children: normal controls, children with low non-verbal I.Q., children identified with specific language impairment, and children with non-specific language impairment. Both I.Q. and language scores have expected mean scores of 100 for normal control children and one standard deviation ranges from 85 to 115. Children with non-specific language impairment scored about two standard deviations below the mean (~ 70) on language as well as non-verbal I.Q. Children with specific language impairment had non-verbal I.Q. scores that were normal (mean = 100), but were almost 2 standard deviations below the mean for the language score. Children with low non-verbal I.Q. scores had nearly normal language scores.


Last Updated Date: 
June 7, 2010