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Table 3 Correlation coefficients between intakes and serum concentrations of folate and vitamin B12

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

  Corresponding serum concentrations
  All participants
(n = 167)
Participants without nausea (n = 121)2
  r p 1 r p 1
Intakes 3     
   Folate [μg/day] 0.251 0.001 0.245 0.007
[μg/1,000 kcal] 0.286 < 0.001 0.280 0.002
Vitamin B12 [μg/day] 0.174 0.025 0.249 0.006
[μg/1,000 kcal] 0.222 0.004 0.313 0.001
  1. 1Partial correlation analysis. Adjusted for research settings
  2. All variables were log-transformed before analyses
  3. 2The participants with nausea were excluded from the analyses
  4. 3Folate and vitamin B12 intakes were assessed by a self-administered diet history questionnaire (DHQ)