Table 1. Sample characteristics (%) and mean (SD) of Alu and LINE-1 methylation across categories of age, race/ethnicity, income, wealth, education, and childhood SES in the study sample.

		Alu†		LINE-1†
		N = 987	Mean (SD)	N = 961	Mean (SD)
Gender	Male	47.5	24.4 (1.1)	47.6	81.1 (1.6)***
	Female	52.5	24.4 (1.2)	52.5	80.4 (1.7)
Age	45 to 64	30.2	24.4 (1.1)	30.2	80.6 (1.7)
	55 to 64	27.5	24.5 (1.2)	27.4	80.7 (1.7)
	65 to 74	30.3	24.3 (1.1)	30.4	80.9 (1.6)
	75 to 84	12.0	24.8 (1.1)	12.0	80.9 (1.8)
Race/ethnicity	White	18.7	24.7 (1.3)**	18.7	80.4 (1.9)**
	African American	28.1	24.4 (1.1)	28.2	80.9 (1.5)
	Hispanic	53.2	24.4 (1.1)	53.1	80.8 (1.6)
Income	<$25,000	39.4	24.4 (1.1)	38.7	80.8 (1.7)
	$25-49,999	34.3	24.4 (1.1)	35.0	80.7 (1.6)
	>$49,999	26.3	24.6 (1.1)	26.3	80.7 (1.7)
Wealth	0 assets	18.8	24.3 (1.2)**	18.7	81.0 (1.6)**
	1 asset	26.2	24.3 (1.2)	26.5	80.8 (1.7)
	2 assets	25.4	24.4 (1.1)	25.2	80.7 (1.5)
	3 assets	17.8	24.7 (1.2)	17.6	80.8 (1.7)
	4 assets	11.8	24.7 (1.2)	12.0	80.3 (1.8)
Education	Less than high school	27.1	24.3 (1.2)	26.7	80.7 (1.7)
	High school	20.3	24.5 (1.1)	20.4	81.0 (1.7)
	Some college	29.7	24.5 (1.2)	29.9	80.6 (1.5)
	College degree or more	22.9	24.4 (1.2)	23.0	80.7 (1.8)
Childhood SES ‡	Low	64.7	24.4 (1.1)	64.6	80.8 (1.6)
	Medium	18.6	24.4 (1.1)	18.3	80.6 (1.8)
	High	16.7	24.6 (1.2)	17.1	80.7 (1.8)

^‡Childhood SES: Low  =  less than high school, medium  =  high school degree, high  =  some college or more. ^†Missing in Alu and LINE-1 samples: Income (14), wealth (3), childhood SES (39 in Alu, 37 in LINE-1) *  =  p<0.05, **  =  p<0.01, ***  =  p<0.001.