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Table 5 Mean daily intakes and Intraclass Correlation Coefficients between intakes estimated from the two-time DHQ (n = 58)

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

  1st DHQ 2nd DHQ   1st DHQ + 2nd DHQ Intraclass Correlation Coefficient
  Mean ± SD Mean ± SD p 1  
Energy [kcal/day] 1727 ± 407 1771 ± 399 0.523 0.599
Folate [μg/day]2 292 ± 120 279 ± 112 0.257 0.725
Vitamin B12 [μg/day]2 5.37 ± 2.79 5.91 ± 2.95 0.052 0.512
  1. DHQ: self-administered diet history questionnaire
  2. 1The paired t-test
  3. 2The analyses were performed after log-transformation of the variables to achieve normal distribution