Korean Journal of Community Nutrition

Original Articles

[English]
Application and Evaluation of Web-based Food Frequency Questionnaire for Korean Adolescents: Jinhee Yum, Seungmin Lee; Korean J Community Nutr 2016;21(5):440-450. Published online October 31, 2016; DOI: https://doi.org/10.5720/kjcn.2016.21.5.440

Abstract PDF PubReader: OBJECTIVES
We previously developed a dish-based semi-quantitative food frequency questionnaire (FFQ) for Korean adolescents and reported that it had reasonable reliability and validity. The objective of the current study was to construct a web-based dietary evaluation system applying the FFQ for Korean adolescents and examine its applicability in the context of reliability and validity.
METHODS
A web-based food frequency questionnaire system was designed using a comprehensive approach, incorporating not only dietary data survey but also up-to-date nutrition information and individualized eating behavior guidelines. A convenience sample of 50 boys and girls aged 12~18 years agreed to participate in the study and completed the FFQ twice and 3 days of dietary recall on the developed website during a two-month period. The FFQâ€™s reliability and validity was examined using correlation and cross classification analysis. We also measured participantsâ€™ subjective levels of the web siteâ€™s usability, visual effect, understanding, and familiarity.
RESULTS
Spearman correlation coefficients for reliability ranged from 0.74 (for vitamin A) to 0.94 (for energy). From cross-classification analyses, the proportion of subjects in the same intake quartile was highest for energy (82.0%) and lowest for vitamin A (56.0%). With regard to validity analysis, Spearman correlation coefficients ranged from 0.34 (for fiber) to 0.79 (for energy). The proportions of subjects in the opposite categories between the first FFQ and 3-day diet recall data were generally low from 0.00% (for fat) to 36.2% (for sodium). Average subjective levels of the websiteâ€™s usability, visual effect, understanding, and familiarity were all found to be over 4 points out of 5 points.
CONCLUSIONS
The web-based dietary evaluation system developed can serve as a valid and attractive tool for administering FFQ to Korean adolescents.

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[English]
Development of a Questionnaire for Dietary Habit Survey of Korean Adults: Jin Suk Jo, Ki Nam Kim; Korean J Community Nutr 2014;19(3):258-273. Published online June 30, 2014; DOI: https://doi.org/10.5720/kjcn.2014.19.3.258

OBJECTIVES
The purposes of the study were to develop a questionnaire for dietary habit survey for Korean adults, and unify the terms related to dietary habits.
METHODS
The Delphi method by 43 professionals on dietary habit research was applied to unify the terms.
RESULTS
With regard to results on terms related to dietary habit, the respondents recorded the highest percentage (90.7%) of selecting the term "dietary habits" and also the highest percentage (76.7%) of choosing "dietary habits" for English. The biggest percentage of the respondents chose "individual dietary behaviors repeatedly formed and habitualized under the social, cultural, and psychological influence in the group" as the concept of dietary habits. The Delphi survey for the development of a questionnaire resulted in the first questionnaire of 31 items, the second one of 27 items, and the third one of 25 items. The validity of questionnaire items was tested with content validity ratios (CVR). The items whose CVR value was 0.29 or lower were eliminated or revised, because the minimum CVR value needed to test validity was 0.29. To test the reliability of questionnaire items, test-retest method was performed in 163 adults. According to the Kappa coefficient in the range of 0.314-0.716, all of the 25 items were in the reliability scope. A survey was taken with 702 adults to finally revise and supplement the third questionnaire whose validity and reliability were tested.
CONCLUSIONS
Through those processes, a questionnaire for adults' dietary habit survey was finally completed. The significance of the study lies in the development of the first questionnaire on dietary habits equipped with both validity and reliability in South Korea.

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[English]
Development and Evaluation of the Semi-quantitative Food Frequency Questionnaire to Assess Folate Intake in Women of Child-bearing Age: Bo Ram Han, Hyun Sook Bae; Korean J Community Nutr 2012;17(2):156-166. Published online April 30, 2012; DOI: https://doi.org/10.5720/kjcn.2012.17.2.156

Abstract PDF PubReader

The aim of this study was to develop and evaluate the simple semi-quantitative food frequency questionnaire (FFQ) for assessing folate intake in women of reproductive age. We developed a 30-item FFQ, and tested the reliability and validity in 97 women aged between 20 and 39 yrs using the FFQs and 24-h recalls, which were carried out twice, respectively. Assessing the reliability, the correlation coefficients were 0.53 (Spearman's) and 0.49 (Pearson's) for folate. There was no significant difference of folate intake between FFQ1 and FFQ2. 36.1% subjects were classified into the same quartile and 83.5% into the same or adjacent quartile divided by folate intake. On determining the validity, the mean folate intake obtained from the FFQ (FFQ1) and 24h-recalls (2-d) were 306.6 +/- 167.2 microg/d and 326.9 +/- 103.3 microg/d, respectively. There was no significant difference between folate intakes from the two methods. The correlation coefficients for folate were 0.24 (Spearman's) and 0.26 (Pearson's). 39.2% of the subjects were categorized into the same quartile and 70.1% were into the same or adjacent quartile. In addition, sensitivity (64.3%) and specificity (62.3%) were estimated to evaluate the adequacy of folate intake. These results suggest that this FFQ would be a useful and a valuable instrument to assess the intake of folate among the Korean women of child-bearing age.

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Development and application of the sodium index to estimate and assess sodium intake for Korean adults
Yeon-Kyung Lee, Taisun Hyun, Heekyong Ro, Young-Ran Heo, Mi-Kyeong Choi
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[English]
Validation of Food Security Measures for the Korean National Health and Nutrition Examination Survey: Kirang Kim, Seo Ah Hong, Sung Ok Kwon, Bo Youl Choi, Ga Young Kim, Se Young Oh; Korean J Community Nutr 2011;16(6):771-781. Published online December 31, 2011; DOI: https://doi.org/10.5720/kjcn.2011.16.6.771

Abstract PDF PubReader

The objective of this study was to assess the reliability and validity of food security measures, which was developed based on the US household food security survey module (US HFSSM) with content validity in the Korean population. The reliability and validity were assessed by internal consistency, construct validity and criterion-related validity. The study included 446 households. Among those, 46.2% were households with children. The proportion of food insecure households was 33.3%. Among those, 35.4% and 64.6% households were food insecure with hunger and without hunger, respectively. The Cronbach's alpha coefficients were 0.84 and the infit value by the Rasch model analysis ranged from 0.68 to 1.43. The scale item response curves by food insecurity severity explained well the nature and characteristics of food security, indicating the highest proportion of "yes" for the items on diet quality, followed by those with diet quantity. The result of criterion-related validity showed that food insecurity status was significantly related in a dose-response manner with the household income level, food expenditure, subjective health state, subjects' educational level. Household food security status was also related to dietary diversity regarding protein foods, fruits and fruit juice, and milk and dairy product. These findings suggest that the food security instrument is reliable and valid and would be used to assess food security status in the Korean population.

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[English]
Development of a Semi-Quantitative Food Frequency Questionnaire for Pre-school Children in Korea: Young Lim, Se Young Oh; Korean J Community Nutr 2002;7(1):58-66. Published online February 28, 2002

Abstract PDF: The purpose of the study was to develop and evaluate the reliability of a semi-quantitative food frequency questionnaire (SFFQ) intended to measure mainly nutrient intake (energy, protein, fat, calcium and iron) related to growth in pre-schoolers in Korea. Based on foods with up to 90 cumulative percent contribution of the 5 nutrients, we developed a SFFQ for 86 foods. In order to evaluate the reliability of both nutrient and food intakes, caregivers of a sample of 101 children aged 4 to 6 years completed the SFFQ repeatedly at 3 month intervals. There were small differences in the nutrient intakes assessed by the SFFQ ranging from 0.55% to 9.91%. There were no significant differences in nutrient values calculated from the repeat questionnaires, except in the case of niacin and vitamin C. The Pearson correlation coefficients of most of the nutrients ranged form 0.54 to 0.75 (mean = 0.66). When energy intake was adjusted, there was approximately a 0.2 decrease in the correlation coefficient of most nutrients, due to the high correlation of energy intake with other nutrients (r=0.7-0.9). The amount of food intake differed by 0.1 to 66.4% (mean = 17.5%), depending on the food item. Out of 86 foods, 74 foods (86%) showed less than a 30% difference in intake and 30 foods (35%) showed less than a 10% difference. Only 6 (7%) out of the 86 foods presented statistically significant differences in intake. The Spearman correlation coefficients of most food intakes assessed repeatedly by the SFFQ ranged from 0.4 to 0.7. Reproducibility of the nutrient and food intakes found in this study was better or similar to those found in cases of Korean adults. Therefore, the SFFQ developed in the present study can be a useful tool to assess the dietary intake of pre-schoolers in Korea.

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[English]
The Development and Evaluation of a Simple Semi-quantitative Food Frequency Questionnaire to Assess the Dietary Intake of Adults in Large Cities: Hee Ja Lee, Haeng Shin Lee, Myung Ju Ha, Seung Hee Kye, Choi Il Kim, Choong Won Lee, Jin Sook Yoon; Korean J Community Nutr 1997;2(3):349-365. Published online August 31, 1997

Abstract PDF: Using data obtained from 1,473 adults aged 18-68 yrs, residing in large cities and by use of a semi-quantitative food frequency questionnaire, we assessed the relative importance of various foods as indicators of both the amount and the variability of selected nutrient intake to develop a simple food frequency questionnaire. Since Cronbach's alpha value of the questionnaire including 78 food items was 0.76, the reliability of this questionnaire was acceptable. A large fraction of the variability of nutrient intake in this population could be explained by the small number of food items. The estimation of dietary nutrient intake such as total calories or protein content, which are derived from almost all foods, will require more food items with nutrients such as calcium or vitamin A, which are concentrated in a few food items. A dietary history ascertaining the intake of as few as 5-19 food items mighted be all needed in order to determent the association between disease outcome and the intake of a single nutrient. There was certainly a high level of agreement with nutrient intake by the sbujects who were cross-classified by quartiles of nutrient indices based on all the food items(78) and by quartiles of nutrient indices based on food items selected by stepwise multiple regression for selected nutrients. The data provided further evidence that useful information on dietary intake over an extended period can be obtained by a simple and relatively inexpensive food frequency questionnaire.

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