. Author manuscript; available in PMC: 2017 Feb 1.

Published in final edited form as: Dev Psychol. 2016 Aug;52(8):1206–1216. doi: 10.1037/dev0000155

Table 5.

Hierarchical Multiple Regressions—Dependent Variable: Mathematical Ability Index

Controlling variables—Age and gender

Model	Predictor	R²	R² ^change	F^change	df	p
First step	Age and gender	.269	—	11.031	60	.000
Model 1	Numerosity N24	.391	.122	11.828	59	.001^**
Model 2	Numerosity N250	.271	.002	.159	59	.691
Model 3	Jnd motion	.278	.009	.709	58	.403

Controlling variables—Age, gender and nonverbal IQ
First step	Age, gender, and IQ	.330	—	9.681	59	.000
Model 1	Numerosity N24	.406	.076	7.452	58	.008^**
Model 2	Numerosity N250	.330	.000	.008	58	.931
Model 3	Jnd motion	.334	.004	.325	57	.571

Note. Predictors were tested in separate regressions models (Model 1, 2, 3), controlling variables were entered as a block in the first step. Significant predictor highlighted in bold.

** p < .01.