Table 2.

Results of the mixed models analyses performed with and without adjusting for covariates

		IDA		IS						Modeled Covariates
Covariate Adjustment	Variable	mean	SE	mean	SE	F	p	effect size		significant	non-significant
Unadjusted	Duration from peak aperture to first contact	0.57	0.08	1.09	0.26	(1,7)=3.60	0.1	1.45
Adjusted	Duration from peak aperture to first contact	0.56	0.13	1.1	0.24	(1,5)=2.74	0.16	1.26			gender, testage
Unadjusted	Straight path	1.87	0.1	1.64	0.08	(1,7)=3.28	0.11	1.38
Adjusted	Straight path	1.96	0.08	1.56	0.04	(1,4)=15.50	0.02	3		testage, bweight_g	gender
Unadjusted	Duration from onset of movement to peak aperture	0.55	0.05	0.52	0.05	(1,7)=0.29	0.61	0.41
Adjusted	Duration from onset of movement to peak aperture	0.32	0.05	0.77	0.05	(1,3)=21.51	0.02	3.53			gender, testage, handsize9, iron ses
Unadjusted	Peak velocity	471.34	64.83	322.95	37.53	(1,7)=3.92	0.09	1.51
Adjusted	Peak velocity	468.86	15	325.06	12.31	(1,4)=51.33	0.002	5.45		gender, moage_t0	testage
Unadjusted	Peak aperture	34.25	1.33	32.87	1.36	(1,7)=0.53	0.49	0.56
Adjusted	Peak aperture	40	2.43	26.8	2.89	(1,3)=6.19	0.09	1.89		gender, moage_t0	testage, handsize
Unadjusted	Number of movement units	2.26	0.29	1.96	0.22	(1,7)=0.66	0.44	0.62
Adjusted	Number of movement units	2.38	0.17	1.86	0.23	(1,5)=2.56	0.17	1.22			gender, testage
Unadjusted	Duration from onset of movement to peak velocity	0.36	0.03	0.56	0.14	(1,7)=2.03	0.2	1.09
Adjusted	Duration from onset of movement to peak velocity	0.31	0.08	0.6	0.13	(1,4)=2.36	0.2	1.17			gender, testage, moage_t0
Unadjusted	Reach duration	1.33	0.15	1.81	0.31	(1,7)=1.90	0.21	1.05
Adjusted	Reach duration	1.22	0.14	1.9	0.32	(1,5)=3.12	0.14	1.35			gender, testage
Unadjusted	Path length	237.94	20.3	189.2	13.89	(1,7)=3.93	0.09	1.51
Adjusted	Path length	221.36	15.21	203.32	7.39	(1,4)=0.94	0.39	0.74		testage	gender, moage_ t0

Note: For each variable, the covariates used in the adjusted analysis and their significance are reported.