title: Both comprehensive and brief self-administered diet history questionnaires satisfactorily rank nutrient intakes in Japanese adults.
abstract: BACKGROUND
  A comprehensive self-administered diet history questionnaire (DHQ: 150-item semi-quantitative questionnaire) and a brief self-administered DHQ (BDHQ: 58-item fixed-portion-type questionnaire) were developed for assessing Japanese diets. We compared the relative validity of nutrient intake derived from DHQ with that from the BDHQ, using semi-weighed 16-day dietary records (DRs) as reference.
  
  
  METHODS
  Ninety-two Japanese women aged 31 to 69 years and 92 Japanese men aged 32 to 76 years completed a 4-nonconsecutive-day DR, a DHQ, and a BDHQ 4 times each (once per season) in 3 areas of Japan (Osaka, Nagano, and Tottori).
  
  
  RESULTS
  No significant differences were seen in estimates of energy-adjusted intakes of 42 selected nutrients (based on the residual method) between the 16-day DRs and the first DHQ (DHQ1) or between the DR and the first BDHQ (BDHQ1) for 18 (43%) and 14 (33%) nutrients, respectively, among women and for 4 (10%) and 21 (50%) nutrients among men. The median (interquartile range) Pearson correlation coefficients with the DR for energy-adjusted intakes of the 42 nutrients were 0.57 (0.50 to 0.64) for the DHQ1 and 0.54 (0.45 to 0.61) for the BDHQ1 in women; in men, the respective values were 0.50 (0.42 to 0.59) and 0.56 (0.41 to 0.63). Similar results were observed for the means of the 4 DHQs and BDHQs.
  
  
  CONCLUSIONS
  The DHQ and BDHQ had satisfactory ranking ability for the energy-adjusted intakes of many nutrients among the present Japanese population, although these instruments were satisfactory in estimating mean values for only a small number of nutrients.
authors.affiliation: Department of Social and Preventive Epidemiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
authors.forename: Satomi
authors.initials: S
authors.lastname: Kobayashi
authors.forename: Satoru
authors.initials: S
authors.lastname: Honda
authors.forename: Kentaro
authors.initials: K
authors.lastname: Murakami
authors.forename: Satoshi
authors.initials: S
authors.lastname: Sasaki
authors.forename: Hitomi
authors.initials: H
authors.lastname: Okubo
authors.forename: Naoko
authors.initials: N
authors.lastname: Hirota
authors.forename: Akiko
authors.initials: A
authors.lastname: Notsu
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Fukui
authors.forename: Chigusa
authors.initials: C
authors.lastname: Date
mesh_terms: D000328:Adult; D000368:Aged; D004032:Diet / Q000706:statistics & numerical data*; D015930:Diet Records; D004034:Diet Surveys / Q000379:methods*; D002149:Energy Intake; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D015596:Nutrition Assessment; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires