Table 1.

Motor speech classifications and demographic, cognitive-language, and speech information for 415 participants with Speech Delay.

Motor Speech Classification		Demographic					Cognitive-Language				Speech
		Age (yrs)			Sex (%)		Cognition^a		Language^b		PCC^c		II^d
	n	M	SD	Range	Female	Male	M	SD	M	SD	M	SD	M	SD
No MSD	341	4.8	1.7	3–16	30.0	70.0	100.6	14.2	96.1	15.6	74.5	12.2	92.1	7.8
SMD	50	5.1	1.7	3–10	20.0	80.0	100.6	12.1	97.2	13.6	71.8	14.3	88.8	10.2
CD	14	4.7	1.6	3–8	21.4	78.6	109.8	11.1	105.0	17.0	70.0	14.8	83.4	14.6
CAS	10	5.0	1.7	3–9	20.0	80.0	63	* ^e	77	* ^e	76.3	9.6	84.4	15.1
Total/Average	415	4.9	1.7	3–16	28.4	71.6	100.8	14.1	96.6	15.4	74.1	12.6	91.2	8.8
Group-Averaged		4.9	1.7		22.9	77.2	93.5	12.5	93.8	15.4	73.2	12.7	87.2	11.9

Notes: PCC = Percentage of Consonants Correct; II = Intelligibility Index; No MSD = No Motor Speech Disorder; SMD = Speech Motor Delay; CD = Childhood Dysarthria; CAS = Childhood Apraxia of Speech.

Scores for Cognition: IQ Composite (n = 25) from Kaufman Brief Intelligence Test – Second Edition; Kaufman and Kaufman (2004).

Total Score Standard Score (General Ability; n = 64) from Detroit Tests of Learning Aptitude-Primary: Third Edition; Hammill and Bryant (2005).

Full IQ (n = 16) from Weschler Abbreviated Scale of Intelligence; Wechsler (1999).

Scores for Language: Oral Composite Standard Score (n = 27) from Oral and Written Language Scales (OWLS); Carrow-Woolfolk (1995).

Oral Composite Standard Score (n = 66) from Oral and Written Language Scales, Second Edition (OWLS-II); Carrow-Woolfolk (2011).

Core Language Standard Scores (n = 23) from Clinical Evaluation of Language Fundamentals-4 (CELF–4); Semel, Wiig, and Secord (2003).

Shriberg et al. (1997).

Shriberg (1993).

Standardized cognition and language measures available for only one participant.