Table 3.

A model integrating task difficulties, the diagnosis groups and their interactions, controlling for sex and age and stratifying by ages 8–12 and 13–18 years

	Age 8–12 years				Age 13–18 years
	β	95% CI	F value	p value	β	95% CI	F value	p value
Spatial working memory (total errors)		F(1,228)				F(1,214)
ASD v. control	−0.17	(−2.99 to 2.65)	0.01	0.904	0.60	(−2.18 to 3.37)	0.18	0.673
6- v. 4-boxes problem	5.95	(3.65 to 8.26)	79.86	<0.001***	3.43	(1.06–5.80)	34.58	<0.001***
8- v. 4-boxes problem	17.76	(15.45 to 20.07)	632.72	<0.001***	10.10	(7.73 to 12.47)	296.88	<0.001***
Group* (6- v. 4-box problem)	3.58	(0.17 to 6.99)	4.26	0.040*	2.83	(−0.42 to 6.08)	2.94	0.088
Group* (8- v. 4-box problem)	8.05	(4.64 to 11.46)	21.59	<0.001***	8.20	(4.95 to 11.44)	24.74	<0.001***
Stockings of Cambridge (mean moves)		F(1,342)				F(1,320)
ASD v. control	0.09	(−0.27 to 0.45)	0.25	0.617	0.02	(−0.33 to 0.37)	0.01	0.906
3- v. 2-move problem	1.24	(0.93 to 1.55)	132.71	<0.001***	1.14	(0.80 to 1.48)	98.81	<0.001***
4- v. 2-move problem	3.35	(3.03 to 3.66)	907.97	<0.001***	3.18	(2.84 to 3.51)	717.92	<0.001***
5- v. 2-move problem	4.82	(4.51 to 5.13)	1906.59	<0.001***	4.00	(3.67 to 4.34)	1394.55	<0.001***
Group* (3- v. 2-move problem)	0.21	(−0.24 to 0.67)	0.85	0.359	0.07	(−0.39 to 0.53)	0.09	0.768
Group* (4- v. 2-move problem)	0.35	(−0.11 to 0.81)	2.22	0.137	−0.03	(−0.50 to 0.43)	0.02	0.885
Group* (5- v. 2-move problem)	0.56	(0.11 to 1.02)	5.84	0.016*	0.80	(0.33 to 1.26)	11.42	0.001

CI, confidence interval; β, regression coefficient estimates; ASD, autism spectrum disorder.

*p < 0.05, **p < 0.01, ***p < 0.001.