Table 1 Study 1, Exploratory and Holdout samples: Results of quadratic regression models with attitude at wave 1 (linear and quadratic terms) predicting attitude change over time (measured using MSSD).

		Exploratory sample			Holdout sample
Attitude		b	95% CI	p	b	95% CI	p
Gender egalitarianism	Linear	–0.00	−0.06–0.06	0.999	−0.01	−0.04 to 0.01	0.304
Gender egalitarianism	Quadratic	0.18	0.12–0.25	<0.001	0.14	0.12–0.17	<0.001
Support for affirmative action	Linear	0.22	0.11–0.33	<0.001	0.17	0.11–0.23	<0.001
Support for affirmative action	Quadratic	0.19	0.10–0.28	<0.001	0.08	0.03–0.12	0.001
Support for redistribution	Linear	0.21	−0.01–0.44	0.066	0.18	0.06–0.29	0.002
Support for redistribution	Quadratic	0.20	0.08–0.32	0.001	0.21	0.15–0.27	<0.001
Support for contraception for teens	Linear	0.10	−0.03–0.23	0.121	0.08	0.02–0.14	0.007
Support for contraception for teens	Quadratic	0.30	0.17–0.44	<0.001	0.24	0.18–0.30	<0.001
Support of gays/lesbians	Linear	−0.03	−0.08–0.03	0.321	−0.00	−0.03 to 0.03	0.936
Support of gays/lesbians	Quadratic	−0.14	−0.22–−0.06	0.001	−0.16	−0.21 to −0.11	<0.001
Disapproval of child corporal punishment	Linear	−0.01	−0.08–0.07	0.870	−0.01	−0.05 to 0.04	0.689
Disapproval of child corporal punishment	Quadratic	0.19	0.12–0.25	<0.001	0.16	0.12–0.20	<0.001
Permissive sex attitudes	Linear	0.02	−0.06–0.10	0.655	0.04	0.00–0.08	0.043
Permissive sex attitudes	Quadratic	0.16	0.08–0.25	<0.001	0.11	0.06–0.15	<0.001
Justification of sexual infidelity	Linear	0.46	0.16–0.76	0.002	0.13	−0.02 to 0.27	0.096
Justification of sexual infidelity	Quadratic	0.09	−0.10–0.29	0.357	0.33	0.25–0.41	<0.001

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