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Table 2 Change from baseline to follow-up in intake and biomarker levels of fish, docosahexaenoic acid (DHA), and mercury, and hair mercury collected at follow-up, by study arm, among 55 pregnant women enrolled in the Food for Thought study

From: A pilot randomized controlled trial to promote healthful fish consumption during pregnancy: The Food for Thought Study

Change from baseline to follow-up

Control N=20

Advice N=18

Advice + Gift Card N=17

Advice vs. Control

Advice + Gift Card vs. Control

Mean (SD) or %

P value*

Supplements

     

DHA from supplements (mg/day)

10 (80)

10 (52)

34 (76)

0.99

0.31

Diet

     

Fish intake (g/day)

2 (17)

14 (22)

24 (36)

0.15

0.01

DHA from fish (mg/day)

−12 (75)

57 (114)

149 (118)

0.04

<0.0001

DHA from fish + supplements (mg/day)

2 (11)

67 (130)

183 (144)

0.10

<0.0001

Mercury intake from fish (mcg/day)

0.4 (1.8)

−0.1 (2.1)

0.9 (1.8)

0.37

0.50

Mercury intake from fish (mcg/kg/day)

0.007 (0.03)

−0.003 (0.02)

0.012 (0.03)

0.27

0.55

Biomarkers

     

Plasma DHA (% of total fatty acids)

0.01 (0.45)

−0.12 (0.66)

−0.07 (0.29)

0.03

0.52

Whole blood mercury (mcg/L)

0.35 (1.12)

−0.26 (0.36)

−0.40 (1.27)

0.67

0.22

Follow-up

     

Hair mercury (mcg/g)

0.31 (0.31)

0.25 (0.23)

0.31 (0.30)

0.50

0.99

  1. * P value from 1-way ANOVA.