Table 4.

Effect of scanner manufacturer (mfg) on MRI metrics (N = 648)

ROI	Full model	Full model without mfg	χ2	P	Full model-mfg
	R2	R2			Diff	Diff%
Gray matter volume
Total	0.8826	0.8611	0.0000	***	0.0215	2.15
Frontal	0.8074	0.7300	0.0000	***	0.0774	7.74
Temporal	0.7652	0.7601	0.0001	***	0.0051	0.51
Parietal	0.8013	0.7915	0.0000	***	0.0098	0.98
Occipital	0.6182	0.5572	0.0000	***	0.0610	6.10
Cingulate	0.6978	0.6837	0.0000	***	0.0141	1.41
Insula	0.5955	0.5605	0.0000	***	0.0350	3.50
Cortical surface area
Total	0.3081	0.1941	0.0000	***	0.1140	11.40
Frontal	0.3360	0.1335	0.0000	***	0.2025	20.25
Temporal	0.1470	0.1093	0.0000	***	0.0377	3.77
Parietal	0.2192	0.2177	0.1348		0.0015	0.15
Occipital	0.3454	0.1286	0.0000	***	0.2168	21.68
Cingulate	0.2407	0.1999	0.0000	***	0.0408	4.08
Insula	0.2143	0.1495	0.0000	***	0.0648	6.48
Cortical thickness
Total	0.9029	0.8953	0.0000	***	0.0076	0.76
Frontal	0.8450	0.8451	0.6287		−0.0002	−0.02
Temporal	0.8111	0.7831	0.0000	***	0.0280	2.80
Parietal	0.8255	0.8193	0.0000	***	0.0063	0.63
Occipital	0.6117	0.5989	0.0000	***	0.0128	1.28
Cingulate	0.7170	0.7165	0.1556		0.0004	0.04
Insula	0.6226	0.5245	0.0000	***	0.0981	9.81
White matter volume
Pons	0.2922	0.2380	0.0000	***	0.0543	5.43
Centrum semiovale	0.7260	0.5482	0.0000	***	0.1778	17.78
Corpus	0.5119	0.4289	0.0000	***	0.0830	8.30

Note: $\text{Model 3}:\text{brai}{\text{n}}_i\sim {\beta }_0+{\beta }_1\text{ag}{\text{e}}_i+{\beta }_2\text{mf}{\text{g}}_i+{\beta }_3\text{ethnicit}{\text{y}}_i+{\beta }_4\text{SE}{\text{S}}_i+{\beta }_5\text{se}{\text{x}}_i+{\beta }_6\text{svo}{\text{l}}_i+{ϵ}_{\mathrm{i}}.$

***P ≤ .0001.