TABLE 3.

Mean RBC levels of DHA and EPA in 987 study participants with CAD by category of SES, adjusted for age, sex, ethnicity, marital status, BMI, physical activity, smoking, alcohol use, statin use, and creatinine clearance¹

SES variable	n	DHA, g/100 g total fatty acids	P	EPA, g/100 g total fatty acids	P	DHA+EPA, g/100 g total fatty acids	P
Household income			<0.001		<0.001		<0.001
<$20,000	475	3.18 (3.01, 3.34)		0.85 (0.74, 0.96)		4.06 (3.81, 4.31)
$20,000–$50,000	322	3.05 (2.87, 3.24)		0.80 (0.67, 0.92)		3.88 (3.60, 4.17)
>$50,000	184	3.53 (3.30, 3.76)		1.13 (0.98, 1.28)		4.70 (4.34, 5.05)
Education			<0.001		<0.001		<0.001
≤11 y	127	2.84 (2.59, 3.09)		0.70 (0.53, 0.86)		3.56 (3.17, 3.95)
High school graduate	516	3.13 (2.97, 3.28)		0.82 (0.72, 0.92)		3.98 (3.74, 4.21)
≥College degree	342	3.55 (3.37, 3.74)		1.11 (0.98, 1.23)		4.68 (4.40, 4.97)
Housing status			0.78		0.95		0.89
SRO/shelter	68	3.12 (2.78, 3.46)		0.86 (0.64, 1.08)		4.01 (3.49, 4.53)
Apartment/flat	436	3.20 (3.02, 3.37)		0.89 (0.78, 1.00)		4.12 (3.86, 4.38)
House	476	3.24 (3.07, 3.40)		0.88 (0.77, 0.99)		4.15 (3.89, 4.40)
Occupation			0.004		<0.001		<0.001
Skilled/unskilled labor	206	3.07 (2.84, 3.29)		0.79 (0.65, 0.93)		3.88 (3.54, 4.23)
Services/sales	243	3.22 (3.02, 3.42)		0.84 (0.72, 0.96)		4.09 (3.79, 4.38)
Manager/official/proprietor	191	3.33 (3.10, 3.56)		0.92 (0.78, 1.06)		4.28 (3.93, 4.62)
Professional/technical	187	3.54 (3.31, 3.77)		1.16 (1.02, 1.30)		4.73 (4.39, 5.07)

¹Values are means (95% CI).