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One reference I have used is: <BR>
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<FONT SIZE="2">Coplan, J. & Gleason, J. (1988). Unclear speech: recognition and significance of unintelligible speech in preschool children. <I>Pediatrics, 82,</I> 447-452.<BR>
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The authors state that intelligibility (to a stranger) is 50% at age 2 years, 75% at age 3:0 and 100% at age 4;0. I'm sure there is great variation across children and situations, but these numbers may be fairly good.<BR>
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</FONT><BLOCKQUOTE><FONT SIZE="2"> Carol Stoel-Gammon<BR>
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<FONT SIZE="2">*****************************************************************<BR>
Carol Stoel-Gammon, Ph.D.<BR>
Professor, Department of Speech and Hearing Sciences<BR>
University of Washington<BR>
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</FONT><B>From: </B>"Kim Ventimiglia" <annkiddy@hotmail.com><BR>
<BLOCKQUOTE><B>Date: </B>Fri, 16 Sep 2005 11:01:26 -0400<BR>
<B>To: </B>info-childes@mail.talkbank.org<BR>
<B>Subject: </B>in need of normative information re: intelligibility<BR>
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<BLOCKQUOTE>Dear colleagues,<BR>
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I am in need of normative information concerning the percentage of utterances that are intelligible in 2, 2.5, and 3 year-old typically-developing children. I have seen a citation for Gard, Gilman, and Gorman but do not have the year or any other publication information. does anyone have this information?<BR>
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Wth thanks,<BR>
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Kim M. DesBarres, MS, CCC-SLP<BR>
Clinical Supervisor<BR>
Donald R. Reed Speech & Hearing Center<BR>
Phleps Memorial Hospital<BR>
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