Table 2.

Mixed model results for income left and right hippocampal volume over development.

	Left				Right
Parameter	Estimate	95% CI	t-statistic	p-value	Estimate	95% CI	t-statistic	p-value
Intercept	2424.39	1843.31, 3005.46	8.30	<0.001	2194.87	1608.35, 2781.39	7.40	<0.001
Estimated ICV	0.001	0.001, 0.002	5.64	<0.001	0.001	0.001, 0.002	6.35	<0.001
Scanner (0)	−129.95	−282.23, 22.34	−1.69	0.094	−423.76	−589.23, −258.28	−5.06	<0.001
Scanner (1)	406.12	194.69, 617.54	3.81	<0.001	345.38	123.95, 566.81	3.09	0.003
Scanner (2)	0	0	–	–	0	0	–	–
Age in years	43.37	20.38, 66.36	3.73	<0.001	26.24	1.54, 50.93	2.10	0.037
Age2	−5.88	−9.23, −2.53	−3.51	0.001	−2.79	−6.49, 0.91	−1.50	0.137
Income	6.32	3.52, 9.12	4.47	<0.001	6.95	4.12, 9.78	4.85	<0.001
Age × Income	0.37	−0.05, 0.79	1.76	0.082	0.37	−0.08, 0.83	1.61	0.109
Age2 × Income	−0.17	−0.28, −0.05	−2.82	0.006	−0.15	−0.28, −0.02	−2.22	0.028

ICV = intracranial volume; CI = confidence interval.