Table 1

Comparison between the baseline visit and the second visit (mean and standard deviation) for the 1,004 ARIC participants in the repeatability study

Variables

Baseline Visit

Second Visit

p-values^#

Total energy intake (kcal/d)

1,651 (593)

1,547 (576)

<0.0001

Choline intake (mg/d)^†

319 (74)

270 (67)

<0.0001

Betaine intake (mg/d)^†

112 (42)

108 (39)

0.16

Folate intake* (μg/d)^†

230 (83)

223 (88)

0.13

Methionine intake* (mg/d)^†

1,706 (441)

1,591 (439)

<0.0001

Vitamin B₆ intake (mg/d)^†

1.71 (0.50)

1.69 (0.69)

0.50

^#p-values were calculated using a t-test

^†Adjusted for total energy intake

Some variables (marked with *) have fewer observations

Bidulescu et al. Nutrition Journal 2009 8:14   doi:10.1186/1475-2891-8-14