title: Reproducibility of a semi-quantitative food frequency questionnaire in Japanese female dietitians.
abstract: OBJECTIVE
  To examine reproducibility of assessed intake of foods and nutrients according to a semi-quantitative food frequency questionnaire (SQFFQ) in Japanese female dietitians.
  
  
  METHODS
  An SQFFQ was self-administered to 106 (21 male and 85 female) Japanese dietitians in Aichi prefecture in autumn 1996 and the same questionnaire was repeated in autumn 1997. Reproducibility was evaluated in terms of consumption of 15 foods and energy and 30 macro- and micro-nutrients based on the SQFFQ from 84 Japanese female dietitians.
  
  
  RESULTS
  For intake of foods, Pearson's correlation coefficients (CCs) with log-transformation and energy adjustment (minimum-median-maximum) ranged from 0.35 (beverages)-0.61-0.71 (dairy products). ANOVA intraclass correlation coefficients (ICCs) with log-transformation and energy adjustment ranged from 0.49 (beverages)-0.74-0.82 (dairy products). Spearman's rank CCs with energy adjustment ranged from 0.43 (confectionery)-0.57-0.76 (dairy products). Weighted kappa statistics with energy adjustment ranged from 0.34 (confectionery)-0.49-0.71 (dairy products). For consumption of nutrients, Pearson's CCs with log-transformation and energy adjustment ranged from 0.23 (zinc)-0.55-0.74 (insoluble dietary fiber). ANOVA ICCs with log-transformation and energy adjustment ranged from 0.37 (zinc)-0.70-0.84 (insoluble dietary fiber). Spearman's rank CCs with energy adjustment ranged from 0.25 (zinc)-0.56-0.74 (magnesium). Weighted kappa statistics with energy adjustment ranged from 0.25 (zinc)-0.50-0.68 (insoluble dietary fiber).
  
  
  CONCLUSIONS
  Substantially high reproducibility of consumption of foods and nutrients was attained from an SOFFQ self-administered to Japanese female dietitians.
authors.affiliation: Nagoya City School of Nutrition, Nagoya, Japan.
authors.forename: Nahomi
authors.initials: N
authors.lastname: Imaeda
authors.forename: Nakako
authors.initials: N
authors.lastname: Fujiwara
authors.forename: Yuko
authors.initials: Y
authors.lastname: Tokudome
authors.forename: Masato
authors.initials: M
authors.lastname: Ikeda
authors.forename: Kiyonori
authors.initials: K
authors.lastname: Kuriki
authors.forename: Teruo
authors.initials: T
authors.lastname: Nagaya
authors.forename: Juichi
authors.initials: J
authors.lastname: Sato
authors.forename: Chiho
authors.initials: C
authors.lastname: Goto
authors.forename: Shinzo
authors.initials: S
authors.lastname: Maki
authors.forename: Shinkan
authors.initials: S
authors.lastname: Tokudome
mesh_terms: D000704:Analysis of Variance; D002138:Calibration; D015930:Diet Records; D004046:Dietetics; D002149:Energy Intake; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D007564:Japan; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*