Table 4.

Nested hierarchical model summary: Restricted, repetitive and stereotyped behavior domain

ADI-R C	R2	B	SE B	95% CI	p
Model 1	0.04				0.435
Constant		5.70	2.16	[1.41, 9.98]	0 .010*
Sex		− 1.00	0.55	[− 2.09, 0.10]	0.073
IQ		− 0.01	0.02	[− 0.05, 0.02]	0.478
ADHD diagnosis		− 0.39	0.48	[− 1.35, 0.57]	0.422
Age		0.01	0.07	[− 0.13, 0.15]	0.889
Model 2	0.09				0.118
Constant		2.69	2.50	[− 2.28, 7.65]	0.286
Sex		− 1.15	0.54	[− 2.23, − 0.07]	0.037
IQ		− 0.01	0.02	[− 0.05, 0.02]	0.506
ADHD diagnosis		− 0.58	0.48	[− 1.54, 0.37]	0.229
Age		0.01	0.07	[− 0.13, 0.15]	0.873
BRIEF GEC		0.05	0.02	[0.01, 0.09]	0.027
Model 3	0.12				0.061
Constant		10.33	4.88	[0.64, 20.01]	0.037
Sex		− 7.62	3.60	[− 14.77, -0.47]	0.037
IQ		− 0.01	0.02	[− 0.05, 0.02]	0.533
ADHD diagnosis		− 0.39	0.49	[− 1.35, 0.58]	0.428
Age		0.01	0.07	[− 1.12, 0.15]	0.857
BRIEF GEC		− 0.07	0.07	[− 0.20, 0.06]	0.309
BRIEF GEC * Sex		0.09	0.05	[− 0.01, 0.20]	0.072

ADI-R autism diagnostic interview- revised, diagnostic algorithm, A reciprocal social interaction domain, B communication domain, C restricted, repetitive and stereotyped behavior domain, ADHD attention deficit/hyperactivity disorder, IQ intelligence quotient, BRIEF_GEC behavior rating inventory of executive function, global executive composite, B unstandardized regression coefficients, CI confidence interval

^*p = 0.017