Table 3.

Multiple linear regression of DHA concentrations on region, participant group and selected maternal characteristics.

Variables	Plasma DHA (wt. %)			Erythrocyte DHA (wt. %)			Plasma DHA (μg/mL)			Erythrocyte DHA (μg/mL)
	Mean	β	P	Mean	β	P	Mean	β	P	Mean	β	P
Region
Inland	1.87	0	Ref.	5.37	0	Ref.	85.3	0	Ref.	96.3	0	Ref.
Lakeland	2.22	0.36	<0.001	6.25	0.92	<0.001	87.0	3.6	0.091	102.2	6.7	<0.001
Coastland	2.66	0.80	<0.001	6.91	1.55	<0.001	112.7	28.4	<0.001	116.6	20.4	<0.001
Participant group
Mid-pregnancy	2.63	0	Ref.	6.59	0	Ref.	99.4	0	Ref.	113.0	0	Ref.
Late pregnancy	2.04	−0.59	<0.001	6.10	−0.49	<0.001	118.8	19.4	<0.001	106.0	−7.0	<0.001
Lactation	2.06	−0.58	<0.001	5.82	−0.79	<0.001	67.1	−32.9	<0.001	95.9	−17.5	<0.001
Age(year)
<25.0	2.15	0	Ref.	5.93	0	Ref.	88.2	0	Ref.	100.2	0	Ref.
25.0–29.9	2.27	0.02	0.623	6.24	0.17	0.129	94.7	1.7	0.499	106.1	2.8	0.191
≥30.0	2.25	0.12	0.029	6.15	0.25	0.050	100.6	7.9	0.006	105.3	4.0	0.108
Education
Middle school or less	2.18	0	Ref.	5.93	0	Ref.	90.1	0	Ref.	100.2	0	Ref.
High school	2.24	0.07	0.187	6.20	0.29	0.033	94.2	7.2	0.016	105.0	5.6	0.034
College or above	2.26	0.12	0.014	6.21	0.36	0.003	96.0	8.5	0.002	105.8	6.4	0.006
Pre-pregnancy BMI
<18.5	2.26	0	Ref.	6.15	0	Ref.	90.7	0	Ref.	103.0	0	Ref.
18.5–23.9	2.27	−0.07	0.073	6.22	−0.06	0.546	96.0	−0.3	0.901	105.9	0.1	0.970
≥24.0	2.12	−0.21	<0.001	5.97	−0.20	0.143	95.3	1.6	0.612	103.2	−1.7	0.523

β, regression coefficient; Ref, reference category.