Table 3.

Mixed model results for income left and right hippocampal volume over development controlling for mother left and right hippocampal residuals, respectively.

	Left				Right
Parameter	Estimate	95% CI	t-statistic	p-value	Estimate	95% CI	t-statistic	p-value
Intercept	2514.10	1337.91, 3690.29	4.42	<0.001	1701.81	650.08, 2753.54	3.31	0.002
Estimated ICV	0.001	0.000, 0.002	2.91	0.008	0.002	0.001, 0.002	4.69	<0.001
Scanner (0)	−162.03	−405.73, 81.67	−1.34	0.188	−540.37	−824.41, −256.32	−3.81	<0.001
Scanner (1)	225.53	−49.73, 500.80	1.64	0.106	183.23	−116.67, 483.13	1.22	0.226
Scanner (2)	0	0	–	–	0	0	–	–
Age in years	39.05	2.22, 75.89	2.13	0.038	18.05	−20.79, 56.89	0.93	0.356
Age2	−2.65	−9.48, 4.17	−0.79	0.436	2.65	−3.65, 8.95	0.85	0.402
Income	9.15	4.50, 13.79	3.98	<0.001	8.60	4.23, 12.96	4.00	<0.001
Age × Income	0.83	0.30, 1.38	3.24	0.004	0.55	−0.09, 1.18	1.76	0.088
Age2 × Income	−0.23	−0.40, −0.07	−2.88	0.006	−0.17	−0.36, 0.01	−1.90	0.065
Mother hippocampus	0.17	−0.17, 0.50	1.01	0.318	−0.17	−0.54, 0.19	−0.96	0.343
Age × Mother hippocampus	−0.01	−0.08, 0.06	−0.30	0.768	−0.01	−0.07, 0.06	−0.24	0.813
Age2 × Mother hippocampus	0.001	−0.02, 0.02	0.14	0.890	0.01	−0.01, 0.03	1.19	0.242

ICV = intracranial volume; CI = confidence interval.