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Table 2 Mean intakes estimated from a self-administered diet-history questionnaire and mean serum concentrations

From: Validity and reproducibility of folate and vitamin B12 intakes estimated from a self-administered diet history questionnaire in Japanese pregnant women

  All participants (n = 167) S Hospital
(n = 76)
T Hospital
(n = 91)
 
  Mean ± SD Mean ± SD Mean ± SD p 1
Intakes     
Energy [kcal/day] 1823 ± 373 1832 ± 377 1815 ± 372 0.770
Folate [μg/day]2 261 ± 107 215 ± 76 299 ± 114 < 0.001
   [μg/1,000 kcal]2 142 ± 48 117 ± 30 164 ± 50 < 0.001
Vitamin B12 [μg/day]2 5.74 ± 3.10 5.66 ± 3.54 5.80 ± 2.70 0.328
   [μg/1,000 kcal]2 3.10 ± 1.35 3.01 ± 1.49 3.17 ± 1.22 0.200
Serum concentrations     
Folate [ng/ml]2 6.57 ± 2.80 5.25 ± 2.52 7.67 ± 2.55 < 0.001
Vitamin B12 [pg/ml]2 268 ± 99 199 ± 69 325 ± 83 < 0.001
  1. 1Student's t-test
  2. 2The analyses were conducted after log-transformation of the variables