Table 1

Baseline characteristics of 55 women enrolled in the Food for Thought study, by study arm
Characteristics Total (N=55) Control (N=20) Advice (N=18) Advice + Gift Card (N=17)
Median (IQR) or N (%)
Age (y) 30.9 (25.6, 33.8) 32.4 (27.7, 34.3) 32.6 (27.9, 35.9) 27.6 (24.5, 32.0)
Gestational age (wks) 16.1 (13.3, 20.7) 19.1 (14.7, 21.0) 15.2 (13.0, 18.6) 16.4 (13.9, 21.0)
Pre-pregnancy BMI (kg/m2) 23.4 (21.1, 28.3) 22.3 (21.1, 27.0) 25.8 (22.8, 34.5) 23.4 (20.7, 28.3)
Single 11 (20%) 4 (20%) 3 (17%) 4 (24%)
First pregnancy 16 (29%) 6 (30%) 6 (35%) 4 (22%)
Race/ethnicity
White 27 (49%) 9 (45%) 9 (50%) 9 (53%)
Black 6 (11%) 2 (10%) 2 (11%) 2 (12%)
Asian 6 (11%) 3 (15%) 2 (11%) 1 (6%)
Hispanic/other 16 (29%) 6 (30%) 5 (28%) 5 (29%)
Working full time 22 (40%) 7 (35%) 6 (35%) 9 (50%)
Never smoker 40 (73%) 14 (70%) 14 (78%) 12 (71%)
Supplements
DHA from supplements, all (mg/day) 0 (0, 200) 0 (0, 160) 0 (0, 200) 0 (0, 180)
DHA from supplements, takers* (mg/day) 200 (200, 275) 238 (200, 315) 200 (200, 200) 200 (180, 200)
Diet
Fish intake (g/day) 11 (4, 23) 10 (4, 18) 15 (2, 37) 10 (7, 23)
DHA intake from fish (mg/day) 41 (11, 113) 40 (11, 63) 75 (6, 203) 40 (32, 111)
DHA from diet > 200 mg/day (%) 8 (15%) 1 (5%) 5 (28%) 2 (12%)
Total DHA diet + supplements (mg/day) 113 (36, 238) 62 (37, 203) 200 (24, 356) 116 (54, 235)
Mercury intake from fish (mcg/day) 0.6 (0.1, 2.0) 0.3 (0.1, 2.1) 0.7 (0.0, 1.8) 0.6 (0.2, 1.5)
Mercury intake (mcg/kg/day) 0.01 (0.00, 0.03) 0.01 (0.00, 0.03) 0.01 (0.00, 0.03) 0.01 (0.00, 0.02)
Biomarkers
Plasma DHA (% of total fatty acids) 1.9 (1.5, 2.3) 1.8 (1.5, 2.2) 2.1 (1.8, 2.4) 1.8 (1.6, 2.2)
Whole blood mercury (mcg/L) 1.0 (0.7, 1.7) 1.1 (0.8, 1.5) 0.9 (0.6, 2.0) 0.9 (0.8, 1.9)
Whole blood mercury > 3.5 mcg/L† (%) 4 (7%) 1 (5%) 1 (6%) 2 (12%)

*Among those taking supplements (n=6 in each of the 3 arms). †Threshold per Mahaffey et al., 2009 [7].

IQR = interquartile range.

Oken et al.

Oken et al. Nutrition Journal 2013 12:33   doi:10.1186/1475-2891-12-33

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