Development and Validation of Food Frequency Questionnaire to Assess Calcium Intake in Postmenopausal Vietnamese Women

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  • KHAN Nguyen Cong
    National Institute of Nutrition, Vietnam
  • MAI Le Bach
    National Institute of Nutrition, Vietnam
  • HIEN Vu Thi Thu
    National Institute of Nutrition, Vietnam Department of International Nutrition, Ochanomizu University Graduate School of Humanities and Sciences
  • LAM Nguyen Thi
    National Institute of Nutrition, Vietnam
  • HOA Vu Quynh
    National Institute of Nutrition, Vietnam
  • PHUONG Tuan Mai
    National Institute of Nutrition, Vietnam
  • NHUNG Bui Thi
    National Institute of Nutrition, Vietnam Department of International Public Health Nutrition, Tokushima University Graduate School of Health Biosciences
  • NAKAMORI Masayo
    Department of International Nutrition, Ochanomizu University Graduate School of Humanities and Sciences
  • SHIMIZU Yukue
    Department of International Nutrition, Ochanomizu University Graduate School of Humanities and Sciences
  • YAMAMOTO Shigeru
    Department of International Nutrition, Ochanomizu University Graduate School of Humanities and Sciences

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This study was done to develop a Food Frequency Questionnaire (FFQ) for assessing calcium intake in Vietnamese based on data from the National Nutrition Survey in 2000. From the data, a total of 36 calcium-rich food items were selected for the FFQ by ranking food items according to their contribution to the population intake of nutrients. The FFQ was validated in 140 postmenopausal women by comparing estimates of calcium intake from the FFQ with those from multi-pass 24 h recalls. The results showed that the Pearson correlation coefficient between the 2 methods was 0.84 (p<0.001), and that the weighted kappa value was 0.44. Cross-classification analysis indicated that 82.1% of subjects were classified into the same or adjacent quartile by both methods. No subject was grossly misclassified by the FFQ. There is no significant difference of calcium intake between the 2 methods (by paired t test, p>0.05). A reproducibility study also presented good correlation between 2 administrations of the FFQ, with Pearson correlation coefficient being 0.93 (p<0.001) and weighted kappa value being 0.67. In conclusion, this FFQ is useful and reliable for estimating calcium intake in population-based epidemiological studies in postmenopausal Vietnamese women.

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