Autism, Processing Speed, and Adaptive Functioning in Preschool Children

Table 1

Cognitive function measured by WPPSI-III index and subtests results and by Griffiths’ Developmental Scales, Adaptive behavior measured by Vineland Adaptive Behavior Scales.

Index/subtests/development scales	WPPSI-III
	N	IQ/DQ/scores	Subtest mean	Std. deviation	Range
WPPSI verbal IQ (VIQ)	113	84,8		16,1	53–133
Information	112		7,4	3,3	1–16
Vocabulary	110		7,4	2,9	2–16
Word Reasoning	111		7,2	3,1	1–15
Comprehension	63		9,0	2,9	3–15
Similarities	67		7,9	2,6	3–15
WPPSI performance IQ (PIQ)	113	93,6		16,7	53–135
Block Design	112		10,3	3,6	1–18
Matrix Reasoning	111		8,8	3,5	1–16
Picture Concepts	111		8,2	3,4	1–17
Picture Completion	67		9,6	3,5	2–19
WPPSI Processing speed (PSQ)	85	76,7		12,2	49–107
Coding	110		5,1	2,9	1–12
Symbol Search	95		5,9	2,6	2–14
WPPSI General Language (GLC)	99	89,9		17,1	45–128
Receptive Vocabulary	96		8,2	3,1	1–15
Picture Naming	95		8,5	3,2	2–16
WPPSI full scale IQ (FSIQ)	113	84,5		14,7	51–121
Griffiths’ verbal functioning	77	33,5		15,9	8–72
Griffiths’ performance functioning	77	46,7		16,3	15–79
Griffiths’ global functioning	77	41,6		14,5	13–73
VABS Communication	187	71,9		18,9	34–120
VABS DLS	187	73,8		16,4	38–117
VABS Socialization	187	70,6		14,7	46–112
VABS Motor	187	76,4		14,5	43–117
VABS total	187	70,5		15,0	42–114

WPPSI-III index scale and Griffiths’  scales mean of 100 and a standard deviation of 15, WPPSI-III subtest scale point range 1–19, mean 10.
VABS: Vineland Adaptive Behavior Scales.
DLS: Daily Living Skills.
IQ: Intellectual Quotient.
DQ: Developmental Quotient.