Table 4.

Model fitting for autistic symptoms and CCPT performance to predict ADHD symptoms in unaffected siblings (US) of autism probands and in US of AS probands

	Inattentive				Hyperactive/impulsive				Oppositional
	US of autism		US of AS		US of autism		US of AS		US of autism		US of AS
	β ± SE	p	β ± SE	p	β ± SE	p	β ± SE	p	β ± SE	p	β ± SE	p
Age							−0.30 ± 0.14	0.038
Autistic symptoms (SCQ)
Social deficits	0.43 ± 0.18	0.017
Communication deficits							0.89 ± 0.44	0.047
Stereotyped behaviors	1.20 ± 0.37	0.002	1.99 ± 0.28	<.001	0.71 ± 0.31	0.024	1.41 ± 0.031	<.001	1.13 ± 0.32	<.001	1.87 ± 0.26	<.001
CCPTa
Perseveration	0.14 ± 0.05	0.003			0.13 ± 0.04	0.001
Detectability											−4.36 ± 1.67	0.011
Response style			3.51 ± 1.67	0.039
Hit SE block change											−10.20 ± 4.44	0.025
Model fitting
R-square (%)	9.4		48.7		11.6		55.9		18.7		42.8
F value	12.44		35.16		7.77		30.84		9.01		18.20
P value	<.001		<.001		<.001		<.001		<.001		<.001

There was no effect from sex or parental educational level

Abbreviations: SCQ the Social Communication Questionnaire, CCPT Conner’s Continuous Performance Test, RT reaction time, β estimate of regression coefficient, SE standard error, ISI inter-stimulus interval

^aOnly the significant CCPT indexes were presented