Reproducibility of a semi-quantitative food frequency questionnaire in Japanese female dietitians.
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.
Imaeda
Nahomi
N
Nagoya City School of Nutrition, Nagoya, Japan.
Fujiwara
Nakako
N
Tokudome
Yuko
Y
Ikeda
Masato
M
Kuriki
Kiyonori
K
Nagaya
Teruo
T
Sato
Juichi
J
Goto
Chiho
C
Maki
Shinzo
S
Tokudome
Shinkan
S
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*