Table 3.

Results of Hierarchical Multiple Regressions for Predicting Spatial Scores^† at Age 5

	Step	Variable	ΔF††	df	adj. R2	Δ adj. R2	Unstandardized Coefficients		Standardized Coefficients			Partial r
							B	SE	β	t	p
Model 1		Constant					−1.49	1.11		−1.34	.186
	1	PLT	8.91**	1,48	.139	.139	5.13	1.80	.353	2.86	.006	.385
	2	Speed	9.74**	2,47	.263	.124	−0.20	0.07	−.372	−3.01	.004	−.402
Model 2		Constant					−3.35	1.90		−1.77	.084
	1	SES	12.46***	3,46	.412	.412	0.57	0.22	.315	2.61	.012	.366
		PPVT					0.02	0.01	.340	2.77	.008	.385
		Age					0.02	0.04	.060	0.60	.554	.089
	2	PLT	5.03*	4,45	.460	.048	3.04	1.44	.060	2.12	.040	.304
	3	Speed	11.47**	5,44	.562	.102	0.05	0.05	−.328	−3.39	.002	−.412
Model 3		Constant					1.21	1.56		0.78	.442
	1	SES	11.65***	3,43	.410	.410	0.21	0.16	.118	1.38	.176	.215
		PPVT					0.01	0.00	.207	2.40	.021	.359
		Age					−0.04	0.03	−.118	−1.50	.141	−.234
	2	TOSA	26.05***	4,42	.627	.217	0.38	0.10	.352	3.71	.001	.511
	3	Z age 4†	22.44	5,41	.753	.126	0.37	0.09	.363	4.01	.000	.541
	4	PLT	1.73	6,40	.757	.004	1.05	1.03	.072	1.02	.315	.161
	5	Speed	13.33***	7,39	.815	.058	−0.13	0.04	−.252	−3.65	.001	−.505

Notes:

^†The “Z age 4” variable is a summary variable calculated by taking the average z-score from the WJ-III and WPPSI given at age 4.

^††Asterisks in this column indicate the p-value of the change in F for a given step of the regression -

^*p < .05;

^**p < .01,

^***p < .001