Reproducibility and Validity of Semi-Quantitative Food Frequency Questionnaire Measuring Dietary Trans-Fatty Acids Intake Among Korean Adults
Nutrition Research and Practice. 2014 Published online 2014 November 5 ⓒ2014 The Korean Nutrition Society and the Korean Society of Community Nutrition http://e-nrp.org Reproducibility and validity of semi-quantitative food frequency questionnaire measuring dietary trans-fatty acids intake among Korean adults Hee-Kyung Joh1,2,3§, Seung-Won Oh4 and Eun Lee5 1Department of Medicine, Seoul National University College of Medicine, Seoul, 110-799, Korea 2Department of Family Medicine, Konkuk University Medical Center, Seoul, 143-729, Korea 3Department of Family Medicine, Seoul National University Health Service Center, 1 Gwanak-ro, Gwanak-gu, Seoul, 151-742, Korea 4Department of Family Medicine, Healthcare System Gangnam Center, Seoul National University Hospital, Seoul, 135-984, Korea 5Department of Nutrition, Konkuk University Medical Center Healthcare Center, Seoul, 143-729, Korea BACKGROUND/OBJECTIVES: Compelling evidence indicates that consumption of trans-fatty acids (TFA) is associated with a wide range of diseases. However, few validated tools for TFA intake assessment are available in Korea. We aimed to validate a food frequency questionnaire (FFQ) estimating usual intake of TFA in Korean adults. MATERIALS/METHODS: Eighty-two healthy adults completed an FFQ with a 3-day diet record (3DDR), and 58 completed a second FFQ at a 1-month interval. To assess the reproducibility of the FFQ, we compared estimated TFA intakes from each FFQ. To assess the validity, we compared estimates from the FFQ with those from the 3DDR. RESULTS: The FFQ was reproducible (Spearman r = 0.71) and provided modest correlations with the 3DDR (Spearman r = 0.38). After adjustment for total energy intake, the correlations increased (r = 0.45).
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