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Validity and reproducibility of a food frequency Questionnaire among Chinese women in Guangdong province.
Asia Pac J Clin Nutr. 2009; 18(2):240-50.AP

Abstract

OBJECTIVE

To evaluate the validity and reproducibility of a food frequency questionnaire (FFQ) developed for assessing the association between dietary factors and breast cancer risk among Chinese women in Guangdong.

METHODS

61 women (24-64 years) were recruited from the community in Guangzhou city. An 81-item FFQ was administered twice, one year apart (FFQ1, FFQ2). In the mean time, six 3-day dietary records (DRs) were collected at two month intervals within the year. Daily consumption of nutrients and foods from the FFQs and DRs, correlation coefficients between the two FFQs and the FFQ with DRs were calculated.

RESULTS

Median intakes of nutrients and food group items are higher in FFQ1 than FFQ2. The energy-adjusted Pearson correlation coefficients between the FFQ1 and FFQ2 ranged from 0.46 to 0.71 for nutrients and 0.36 to 0.66 for food group items, respectively. In the validation study, energy-adjusted correlation coefficients were 0.25 to 0.65 for nutrients and 0.30 to 0.68 for food groups. Mean proportion of subjects being classified into the same quartile of nutrients and foods intake from the FFQ and DRs was 36% and 43%, respectively. Mean misclassification of subjects into opposite quartiles was 5% for nutrients and 3% for foods. Bland-Altman analysis showed that no linear trend existed between the differences and means for nutrients.

CONCLUSIONS

The 81-item FFQ has satisfactory reproducibility and reasonable validity, and is useful in assessing the usual consumption of major nutrients and food groups among Chinese women in Guangdong.

Authors+Show Affiliations

Department of Community and Family Medicine, 4th Floor, School of Public Health, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin NT, Hong Kong SAR.No affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Validation Study

Language

eng

PubMed ID

19713184

Citation

Zhang, Cai-Xia, and Suzanne C. Ho. "Validity and Reproducibility of a Food Frequency Questionnaire Among Chinese Women in Guangdong Province." Asia Pacific Journal of Clinical Nutrition, vol. 18, no. 2, 2009, pp. 240-50.
Zhang CX, Ho SC. Validity and reproducibility of a food frequency Questionnaire among Chinese women in Guangdong province. Asia Pac J Clin Nutr. 2009;18(2):240-50.
Zhang, C. X., & Ho, S. C. (2009). Validity and reproducibility of a food frequency Questionnaire among Chinese women in Guangdong province. Asia Pacific Journal of Clinical Nutrition, 18(2), 240-50.
Zhang CX, Ho SC. Validity and Reproducibility of a Food Frequency Questionnaire Among Chinese Women in Guangdong Province. Asia Pac J Clin Nutr. 2009;18(2):240-50. PubMed PMID: 19713184.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Validity and reproducibility of a food frequency Questionnaire among Chinese women in Guangdong province. AU - Zhang,Cai-Xia, AU - Ho,Suzanne C, PY - 2009/8/29/entrez PY - 2009/8/29/pubmed PY - 2009/10/2/medline SP - 240 EP - 50 JF - Asia Pacific journal of clinical nutrition JO - Asia Pac J Clin Nutr VL - 18 IS - 2 N2 - OBJECTIVE: To evaluate the validity and reproducibility of a food frequency questionnaire (FFQ) developed for assessing the association between dietary factors and breast cancer risk among Chinese women in Guangdong. METHODS: 61 women (24-64 years) were recruited from the community in Guangzhou city. An 81-item FFQ was administered twice, one year apart (FFQ1, FFQ2). In the mean time, six 3-day dietary records (DRs) were collected at two month intervals within the year. Daily consumption of nutrients and foods from the FFQs and DRs, correlation coefficients between the two FFQs and the FFQ with DRs were calculated. RESULTS: Median intakes of nutrients and food group items are higher in FFQ1 than FFQ2. The energy-adjusted Pearson correlation coefficients between the FFQ1 and FFQ2 ranged from 0.46 to 0.71 for nutrients and 0.36 to 0.66 for food group items, respectively. In the validation study, energy-adjusted correlation coefficients were 0.25 to 0.65 for nutrients and 0.30 to 0.68 for food groups. Mean proportion of subjects being classified into the same quartile of nutrients and foods intake from the FFQ and DRs was 36% and 43%, respectively. Mean misclassification of subjects into opposite quartiles was 5% for nutrients and 3% for foods. Bland-Altman analysis showed that no linear trend existed between the differences and means for nutrients. CONCLUSIONS: The 81-item FFQ has satisfactory reproducibility and reasonable validity, and is useful in assessing the usual consumption of major nutrients and food groups among Chinese women in Guangdong. SN - 0964-7058 UR - https://www.unboundmedicine.com/medline/citation/19713184/Validity_and_reproducibility_of_a_food_frequency_Questionnaire_among_Chinese_women_in_Guangdong_province_ L2 - http://apjcn.nhri.org.tw/server/APJCN/18/2/240.pdf DB - PRIME DP - Unbound Medicine ER -