Evaluation of a Short-Form of the Food Frequency Questionnaire for Japanese Working Women

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  • Kobayashi Ayumi
    School of Nursing, Faculty of Health Science, Gumma Paz College
  • Miyazaki Yukiko
    Faculty of Health Care, Takasaki University of Health and Welfare
  • Lee Jung-Su
    School of Public Health, Graduate School of Medicine, The University of Tokyo
  • Matsumura Yasuhiro
    Faculty of Health and Nutrition, Bunkyo University
  • Suzuki Reiko
    Division of Medical Nutrition, Department of Healthcare, Tokyo Healthcare University
  • Hayashi Kunihiko
    Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences

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Background & Aims: To evaluate the reproducibility and relative validity of a short-form food frequency questionnaire (SF-FFQ) for intake of 11 food items and breakfast in Japanese working women.<br>Methods: The subjects were 40 female nurses. Reproducibility was evaluated by comparing the SF-FFQs (SF-FFQ1 and 2) measured twice at 5- to 7-month intervals. The relative validity of the SF-FFQs was assessed by using the mean weight (mDR, g/day) or mean frequency (mfDR, times/week) of the two 7-consecutive-day dietary records.<br>Results: The kappa statistics (K), proportions in corresponding categories, and the Spearman's rank correlation coefficient (ρ) for the reproducibility were 0.16-0.75, 0.40-0.90, and 0.27-0.86. For the relative validity, the median (range) of energy-adjusted ρ between SF-FFQ2 and mDR for 11 food items was 0.36 (0.00-0.66) and 0.28 (-0.25-0.81) for shift workers. The agreement between SF-FFQ2 and mfDR in corresponding categories was 90% for both breakfast frequency and main staple food. The ρ between SF-FFQ2 and mfDR of breakfast was 0.56 and 0.50 for shift workers, and the K of main staple foods was 0.74 and 0.52 for shift workers.<br>Conclusions: This SF-FFQ has good reproducibility and relative validity for most food items regardless of work schedule.

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