Association of Social Engagement with Brain Volumes Assessed by Structural MRI

Table 1

Descriptive statistics.

	𝑁	(%)	Social Engagement; (Range −0.79, 1.09)	(SD)	Total brain volume; (Range 880.6, 1449.3)	(SD)
All	348	(100%)	0.01	(0.33)	1137.4	(100.4)
Age
48–59	82	(23.6%)	−0.07	(0.35)	1187.5	(94.6)
60–64	92	(26.4%)	0.04	(0.32)	1161.3	(90.6)
65–69	84	(24.1%)	0.02	(0.29)	1123.9	(81.8)
70–82	90	(25.9%)	0.07	(0.33)	1079.7	(100.4)
			𝑃=0.028		𝑃<0.001
Race/ethnicity
White/Non-Hispanic	315	(90.5%)	0.02	(0.32)	1141.6	(99.9)
All other	33	(9.6%)	−0.05	(0.40)	1097.1	(97.9)
			𝑃=0.25		𝑃=0.015
Educational attainment
<High school	25	(7.2%)	−0.05	(0.41)	1083.1	(74.7)
High school	90	(25.9%)	−0.05	(0.32)	1139.8	(97.4)
High school + trade school	167	(48.0%)	0.03	(0.30)	1135.8	(101.6)
College degree	56	(16.1%)	0.04	(0.34)	1171.6	(92.2)
Graduate degree	10	(2.9%)	0.28	(0.41)	1086.1	(137.9)
			𝑃=0.018		𝑃=0.002
Hypertension
Yes	180	(51.7%)	0.01	(0.32)	1116.6	(97.5)
No	168	(48.3%)	0.01	(0.33)	1159.6	(99.0)
			𝑃=0.97		𝑃<0.001
Diabetes
Yes	54	(15.5%)	−0.01	(0.29)	1098.8	(90.5)
No	294	(84.5%)	0.02	(0.34)	1144.4	(100.7)
			𝑃=0.59		𝑃=0.002
Control status
Population-based control	43	(12.4%)	0.12	(0.29)	1103.5	(100.5)
Former lead worker	305	(87.6%)	0.00	(0.33)	1142.1	(99.6)
			𝑃=0.018		𝑃=0.018

All 𝑃-values from analysis of variance (ANOVA) tests.