Table 4

Mean intakes in each quintile based on corresponding serum concentrations and cross-classification between quintiles of intakes and serum concentrations (n = 167)

Corresponding serum concentrations

Agreement (% classified into the same or adjacent quintile)1

Discordance (% classified into the opposite quintile)1

Linear trend2

p


1st quintile

2nd quintile

3rd quintile

4th quintile

5th quintile


Mean ± SD

Mean ± SD

Mean ± SD

Mean ± SD

Mean ± SD


Intakes

Folate [μg/day]

209 ± 96

258 ± 91

249 ± 91

286 ± 101

296 ± 134

64.7

4.8

0.003

[μg/1,000 kcal]

115 ± 39

145 ± 46

139 ± 49

145 ± 35

164 ± 58

61.1

3.6

0.002

Vitamin B12 [μg/day]

4.62 ± 2.43

6.36 ± 4.20

6.02 ± 2.91

4.88 ± 1.81

6.82 ± 3.17

54.5

4.2

0.029

[μg/1,000 kcal]

2.57 ± 1.29

3.23 ± 1.68

3.20 ± 1.24

2.90 ± 0.84

3.58 ± 1.41

59.9

4.2

0.005


Folate and vitamin B12 intakes were assessed by a self-administered diet history questionnaire (DHQ)

1Agreement and discordance in quintile ranking was assessed as the percentage classification for the pregnant women based on intake and corresponding serum concentration in the same, adjacent, and opposite quintiles.

2Linear regression analyses were performed to test for significant linear trends between intakes and serum concentrations, adjusting for research settings. The dependent variables were log-transformed

Shiraishi et al. Nutrition Journal 2012 11:15   doi:10.1186/1475-2891-11-15

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