Validity and Reproducibility of a Self-administered Food Frequency Questionnaire in the JPHC Study Cohort II: Study Design, Participant Profile and Results in Comparison with Cohort I

Abstract

The objective of this study was to evaluate the validity and reproducibility of a self-administered food frequency questionnaire (FFQ) to estimate nutrient and food intake in the subjects of the Japan Public Health Center-based prospective Study on Cancer and Cardiovascular Diseases (JPHC Study Cohort II). The FFQ was originally developed to estimate intake in the JPHC Study Cohort I. A total of 392 subjects were recruited from the entire cohort participants in the 6 areas of Cohort II on a voluntary basis. The subjects completed the FFQ used for the 5-year follow-up survey twice at approximately a 1-year interval. Seven-day dietary records (DR) and blood samples were collected 4 times at 3-month intervals over a year. Daily nutrient and food intakes from FFQ and DR were estimated. The Spearman correlation coefficients for estimated intakes were calculated between FFQ and DR for validity, and between 2 identical FFQs for reproducibility. Correlation coefficients for the validity ranged from 0.09 to 0.82 among various nutrients and food groups. The correlation coefficients for most of the nutrients and food groups were improved to a level comparable to that of Cohort I by energy-adjustment. Correlation coefficients for reproducibility ranged from 0.42 to 0.82, similar to those of Cohort I.

Comparison of relative validity of food group intakes estimated by comprehensive and brief-type self-administered diet history questionnaires against 16 d dietary records in Japanese adults

“…The performance of both the DHQ and BDHQ in the present study was thus comparable with these other extensive (23,24) and short dietary questionnaires (17,25,26) . To our knowledge, the present study is the first validation study to compare food group intakes obtained from long and short versions of the same questionnaire.…”

Reproducibility of a Short Food Frequency Questionnaire for Japanese General Population

“…Our reproducibility figures were 10% on average higher than those with smaller minimum-maximum ranges, which may be partly due to the fact that the number of subjects in this survey was greater than those in the recent literature. [11][12][13] In conclusion, we previously observed fairly high relative validity values for consumption of foods and nutrients estimated with our short FFQ versus those assessed with 3-day weighed diet records. 14 Moderate validity was attained for intake of fatty acids measured with our FFQ against plasma concentration.…”

“…The proportions categorized into the same quintiles, those categorized into the same quintiles plus adjacent quintiles, or those categorized into the opposite quintiles. Authors Ogawa K et al 11 Sasaki S et al 12 Ishihara J et al 13 Present study (2007) We formerly observed fairly high validity values for consumption of energy and macro-and micro-nutrients assessed with our questionnaire versus 3-day weighed diet records. 16 We also detected moderate validity between intake of fatty acids estimated with this questionnaire against plasma concentration.…”

“…[11][12][13] The median Spearman's rank CCs for foods and nutrients distributed between 0.49 and 0.57 in both sexes. Our reproducibility figures were 10% on average higher than those with smaller minimum-maximum ranges, which may be partly due to the fact that the number of subjects in this survey was greater than those in the recent literature.…”

Alcohol consumption‐associated breast cancer incidence and potential effect modifiers: the Japan Public Health Center‐based Prospective Study

“…Spearman rank correlation coefficients between the FFQs and DRs were 0.44 (107 women) in Cohort I 43 and 0.40 (178 women) in Cohort II for the baseline survey, 41 and 0.51 (113 women) in Cohort I 44 and 0.48 (176 women) in Cohort II 45 for the 5-year follow-up survey.…”