American Academy of Pediatrics

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TABLE 1

Subject Characteristics and Differences by the Presence or Absence of Comorbid ADHD

Variable	Total ASD	ASD (−) ADHD	ASD (+) ADHD	P	Effect Size
Variable	(n = 3319)	(n = 1816; 54.7%)	(n = 1503; 45.3%)	P	Effect Size
Demographic data
Age, y, mean (SD)	10.3 (3.08)	9.9 (3.06)	10.8 (3.0)	<.001	0.30^a
Boys, No. (%)	2753 (83.0)	1481 (81.6)	1272 (84.6)	.019	0.04^b
White race, No. (%)	2894 (87.2)	1574 (86.7)	1320 (87.8)	.348	NA
Hispanic race and/or ethnicity, No. (%)	254 (7.7)	150 (8.3)	104 (6.9)	.150	NA
Phenotypic data
ID, No. (%)	649 (19.6)	381 (21.0)	268 (17.8)	.023	0.04^b
SRS total raw score, mean (SD)	112.60 (26.10)	110.04 (26.22)	115.70 (25.63)	<.001	0.22^a
Psychiatric comorbidities, No. (%)
Anxiety disorder	1025 (30.9)	345 (19.0)	680 (45.2)	<.001	0.28^b
Mood disorder	532 (16.0)	146 (8.0)	386 (25.7)	<.001	0.24^b

Variable	Total ASD	ASD (−) ADHD	ASD (+) ADHD	P	Effect Size
Variable	(n = 3319)	(n = 1816; 54.7%)	(n = 1503; 45.3%)	P	Effect Size
Demographic data
Age, y, mean (SD)	10.3 (3.08)	9.9 (3.06)	10.8 (3.0)	<.001	0.30^a
Boys, No. (%)	2753 (83.0)	1481 (81.6)	1272 (84.6)	.019	0.04^b
White race, No. (%)	2894 (87.2)	1574 (86.7)	1320 (87.8)	.348	NA
Hispanic race and/or ethnicity, No. (%)	254 (7.7)	150 (8.3)	104 (6.9)	.150	NA
Phenotypic data
ID, No. (%)	649 (19.6)	381 (21.0)	268 (17.8)	.023	0.04^b
SRS total raw score, mean (SD)	112.60 (26.10)	110.04 (26.22)	115.70 (25.63)	<.001	0.22^a
Psychiatric comorbidities, No. (%)
Anxiety disorder	1025 (30.9)	345 (19.0)	680 (45.2)	<.001	0.28^b
Mood disorder	532 (16.0)	146 (8.0)	386 (25.7)	<.001	0.24^b

NA, not applicable.

a

Cohen’s d.

b

Phi.