TABLE 5.

MATHEMATICS NC: MEANS (AND SD) AT 7, 9, AND 10 (ADJUSTED FOR AGE), BY ZYGOSITY AND SEX; AND ANOVA RESULTS SHOWING SIGNIFICANCE AND EFFECT SIZE, BY SEX AND ZYGOSITY

	Zygosity		Sex		ANOVA
Measure at 7	MZ (n=4,063–4,118)	DZ (n=7,270–7,337)	Female (n=5,829–5,894)	Male (n=5,504–5,561)	Zygosity	Sex	Zygosity × Sex
Using and Applying	−.05 (1.00)	.03 (1.00)	−.04 (.94)	.04 (1.06)	p<.001 η2=.001	p=.003 η2=.001	p=.008 η2=.001
Numbers and Algebra	−.05 (1.00)	.03 (1.00)	−.04 (.95)	.04 (1.05)	p<.001 η2=.001	p=.002 η2=.001	p=.028 η2<.001
Shapes, Space and Measures	−.06 (1.01)	.03 (.99)	−.01 (.94)	.01 (1.06)	p<.001 η2=.002	p=.658 η2<.001	p=.028 η2<.001
Composite	−.05 (1.00)	.03 (1.00)	−.03 (.94)	.03 (1.06)	p<.001 η2=.002	p=.026 η2<.001	p=.012 η2=.001
	Zygosity		Sex		ANOVA
Measure at 9	MZ (n=1,932–1,946)	DZ (n=3,413–3,441)	Female (n=2,809–2,832)	Male (n=2,539–2,555)	Zygosity	Sex	Zygosity × Sex
Using and Applying	−.06 (.99)	.03 (1.01)	−.04 (.96)	.05 (1.04)	p=.002 η2=.002	p=.014 η2=.001	p=.050 η2=.001
Numbers and Algebra	−.05 (.99)	.03 (1.00)	−.06 (.97)	.07 (1.03)	p=.005 η2=.001	p<.001 η2=.003	p=.214 η2<.001
Shapes, Space and Measures	−.06 (.99)	.03 (1.00)	−.02 (.96)	.03 (1.04)	p=.001 η2=.002	p=.207 η2<.001	p=.113 η2<.001
Composite	−.06 (.99)	.03 (1.00)	−.04 (.96)	.05 (1.04)	p=.001 η2=.002	p=.008 η2=.001	p=.094 η2=.001
	Zygosity		Sex		ANOVA
Measure at 10	MZ (n=1,995–2,021)	DZ (n=3,596–3,632)	Female (n=2,943–2,972)	Male (n=2,648–2,681)	Zygosity	Sex	Zygosity × Sex
Using and Applying	−.04 (1.00)	.02 (1.00)	−.06 (.95)	.06 (1.05)	p=.020 η2=.001	p<.001 η2=.003	p=.685 η2<.001
Numbers and Algebra	−.04 (.99)	.02 (1.01)	−.06 (.95)	.07 (1.05)	p=.027 η2=.001	p<.001 η2=.003	p=.556 η2<.001
Shapes, Space and Measures	−.06 (1.00)	.03 (1.00)	−.04 (.95)	.05 (1.05)	p=.001 η2=.002	p=.003 η2=.002	p=.770 η2<.001
Composite	−.05 (1.00)	.03 (1.00)	−.06 (.95)	.06 (1.05)	p=.006 η2=.001	p<.001 η2=.003	p=.567 η2<.001