The Kennedy Krieger study looked at 535 children ages 8 or older who had not put words together in meaningful phrases by the time they were 4 years old. Of the 535 participants, 119 children had mastered speaking in phrases by their eighth birthday, and 253 were speaking fluently. One hundred sixty-three children never gained phrase or fluent speech.
The study showed that children with typical nonverbal intelligence scores and those who were interested in engaging in social interactions were most likely to make significant gains in language.
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