Relative validity and reliability of a quantitative food frequency questionnaire for adults in Guam

  • Rachael T. Leon Guerrero University of Guam, College of Natural & Applied Sciences
  • Marie Chong
  • Rachel Novotny
  • Lynne R. Wilkens
  • Grazyna Badowski
  • Michelle Blas-Laguana
  • Suzanne Murphy
Keywords: Food frequency questionnaire, dietary assessment, relative validation, Guam


Background: Guam is a US territory in the western Pacific with a diverse population that includes understudied ethnic groups such as Chamorros and Filipinos. A food frequency questionnaire (FFQ) to estimate dietary intake was needed to facilitate studies of diet and health among adults living in Guam.

Objective: To develop and validate an FFQ to assess dietary intake over a 1-year period among adult Guam residents.

Design: A three-part study was conducted: 1) an initial cross-sectional study using 24-h recalls to identify a food and beverage list for the FFQ and resulting in a final FFQ containing 142 food and drink items; 2) to test reliability, 56 different individuals completed the FFQ twice; and 3) to test relative validity, self-administered FFQs and up to 2 days of food record data from an additional 109 individuals were collected, and daily nutrient intake from the two methods was compared.

Results: The reliability of the FFQ was very good (ρ range=0.65–0.75), and the relative validity of the FFQ was good for women (median Spearman’s correlation [ρ] between instruments of 0.45 across 20 nutrients and an interquartile range [IQR] of 0.42–0.58) and generally adequate for men (median ρ=0.31, IQR=0.23–0.55). Validity was also good for Chamorros (median ρ=0.47, IQR=0.38–0.53) and generally adequate for Filipinos (median ρ=0.42, IQR=0.20–0.62). Correlations after energy adjustment were lower (overall median ρ=0.20, IQR=0.14–0.26).

Conclusions: The FFQ can be used to rank nutrient intake for adults in Guam and may be helpful in the analysis of relationships between diet and chronic disease in Guam.

Keywords: food frequency questionnaire; dietary assessment; relative validation; Guam

(Published: 5 May 2015)

Citation: Food & Nutrition Research 2015, 59: 26276 -


Download data is not yet available.

Author Biography

Rachael T. Leon Guerrero, University of Guam, College of Natural & Applied Sciences
Associate Director, Western Pacific Tropical Research Center
How to Cite
Leon Guerrero R. T., Chong M., Novotny R., Wilkens L. R., Badowski G., Blas-Laguana M., & Murphy S. (2015). Relative validity and reliability of a quantitative food frequency questionnaire for adults in Guam. Food & Nutrition Research, 59.
Original Articles

Similar Articles

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 > >> 

You may also start an advanced similarity search for this article.