Dong Woo Kim1, Sujin Song1, Jung Eun Lee2, Kyungwon Oh3, Jeeseon Shim3, Sanghui Kweon3, Hee Young Paik1, Hyojee Joung4. 1. 1Department of Food and Nutrition,Seoul National University,Gwanak-gu,Seoul,Republic of Korea. 2. 2Department of Food and Nutrition,Sookmyung Women's University,Yongsan-gu,Seoul,Republic of Korea. 3. 3Division of Health and Nutrition Survey,Korea Centers for Disease Control and Prevention,Cheongwon-gun,Chungcheongbuk-do,Republic of Korea. 4. 4The Graduate School of Public Health and Institute of Health and Environment,Seoul National University,1 Gwanak-ro,Gwanak-gu,Seoul 151-742,Republic of Korea.
Abstract
OBJECTIVE: We aimed to evaluate the reproducibility and validity of the newly developed FFQ for the Korean National Health and Nutrition Examination Survey (KNHANES) and to estimate the measure's calibration factors. DESIGN: The 109-item FFQ was administered twice, approximately 9 months apart. We also collected four seasonal 3 d dietary records (DR) as a reference method. Correlation coefficients and joint classification were computed to compare intakes of energy, thirteen nutrients and eleven food groups between the two FFQ to evaluate reproducibility. For validity, de-attenuated and energy-adjusted correlation, joint classification and Bland-Altman statistics were calculated for energy and nutrients between the first FFQ and the DR. To calibrate the FFQ, we performed a linear regression analysis in which the DR were the dependent variables and FFQ, age and sex were the independent variables. SETTING: Seoul metropolitan area, Republic of Korea. SUBJECTS: A total of 126 adults aged 20-65 years. RESULTS: The average correlation coefficients measuring reproducibility were 0·54 for nutrients and 0·57 for food groups. The mean correlation coefficient measuring validity was 0·40 for all nutrients between the first FFQ and the DR. On average, 75 % of the participants were classified into the same or adjacent quartiles, while 5 % of the participants were grossly misclassified. The mean energy and nutrient intakes estimated by the calibrated FFQ were similar to the means estimated by the DR. CONCLUSIONS: The newly developed FFQ for assessing dietary intake in the KNHANES has acceptable reproducibility and modest validity compared with a 12 d DR collected over a 9-month period.
OBJECTIVE: We aimed to evaluate the reproducibility and validity of the newly developed FFQ for the Korean National Health and Nutrition Examination Survey (KNHANES) and to estimate the measure's calibration factors. DESIGN: The 109-item FFQ was administered twice, approximately 9 months apart. We also collected four seasonal 3 d dietary records (DR) as a reference method. Correlation coefficients and joint classification were computed to compare intakes of energy, thirteen nutrients and eleven food groups between the two FFQ to evaluate reproducibility. For validity, de-attenuated and energy-adjusted correlation, joint classification and Bland-Altman statistics were calculated for energy and nutrients between the first FFQ and the DR. To calibrate the FFQ, we performed a linear regression analysis in which the DR were the dependent variables and FFQ, age and sex were the independent variables. SETTING: Seoul metropolitan area, Republic of Korea. SUBJECTS: A total of 126 adults aged 20-65 years. RESULTS: The average correlation coefficients measuring reproducibility were 0·54 for nutrients and 0·57 for food groups. The mean correlation coefficient measuring validity was 0·40 for all nutrients between the first FFQ and the DR. On average, 75 % of the participants were classified into the same or adjacent quartiles, while 5 % of the participants were grossly misclassified. The mean energy and nutrient intakes estimated by the calibrated FFQ were similar to the means estimated by the DR. CONCLUSIONS: The newly developed FFQ for assessing dietary intake in the KNHANES has acceptable reproducibility and modest validity compared with a 12 d DR collected over a 9-month period.
Authors: Tai Kyung Koh; Hyesook Park; Yun-Chul Hong; Mina Ha; Yangho Kim; Bo-Eun Lee; Surabhi Shah; Eunhee Ha Journal: Ann Occup Environ Med Date: 2021-04-23
Authors: Soo Jeong Kim; Jin A Han; Young Hwa Kim; Bo Youl Choi; Su Young Kim; Hun Je Lee; In Hwan Oh; Sung-Il Cho; Jakyoung Lee; Soon Young Lee Journal: Epidemiol Health Date: 2015-10-20