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Table 1 Folate intake (μg/day) assessed by the dietary records and food frequency questionnaire, and their correlation coefficients.

From: Validity of a self-administered food frequency questionnaire (FFQ) and its generalizability to the estimation of dietary folate intake in Japan

 

DR1

FFQ2

 

Spearman correlation

 

Mean ± SD

Median

Range

Mean ± SD

Median

Range

% difference of mean

Crude

Energy-adjusted3

Deattenuated

Cohort I

          

   Men (n = 102)

425 ± 103

427

210–735

473 ± 231

444

119–1807

11

0.49

0.40

0.57

   Women (n = 113)

389 ± 106

380

153–667

476 ± 287

419

146–1978

22

0.29

0.35

0.47

Cohort II

          

   Men (n = 174)

467 ± 156

443

197–1280

421 ± 190

370

85–1178

-10

0.33

0.50

0.63

   Women (n = 176)

426 ± 112

417

198–980

454 ± 237

397

4–1498

7

0.42

0.48

0.63

  1. 1 DR, dietary records
  2. 2 FFQ, food frequency questionnaire.
  3. 3 Folate was adjusted for total energy intake using the residual method.
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Nutrition Journal

ISSN: 1475-2891

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